Abstract
One of the four national HIV prevention goals is to incorporate combinations of effective, evidence-based approaches to prevent HIV infection. In fields of public health, techniques that alter environment and affect choice options are effective. Structural approaches may be effective in preventing HIV infection. Existing frameworks for structural interventions were lacking in breadth and/or depth. We conducted a systematic review and searched CDC’s HIV/AIDS Prevention Research Synthesis Project’s database for relevant interventions during 1988–2013. We used an iterative process to develop the taxonomy. We identified 213 structural interventions: Access (65%), Policy/Procedure (32%), Mass Media (29%), Physical Structure (27%), Capacity Building (24%), Community Mobilization (9%), and Social Determinants of Health (8%). Forty percent targeted high-risk populations (e.g., people who inject drugs [12%]). This paper describes a comprehensive, well-defined taxonomy of structural interventions with 7 categories and 20 subcategories. The taxonomy accommodated all interventions identified.
Resumen
Uno de los cuatro objetivos nacionales de prevención del VIH es usar combinaciones de enfoques los cuales son eficaces y basadas en evidencia para prevenir la infección por el VIH. En los campos de la salud pública, técnicas que alteran el medio ambiente y afectan opciones son eficaces. Enfoques estructurales pueden ser eficaces en la prevención de la infección por VIH. Los marcos existentes para las intervenciones estructurales carecían en amplitude, en profundidad, o en ambos. Se realizó una revisión sistemática y búsquedas en la base de datos del proyecto Síntesis de los VIH/SIDA Prevención Investigaciónes de los Centros para el Control y la Prevención de Enfermedades para intervenciones pertinentes publicado durante 1988-2013. Utilizamos un proceso iterativo para desarrollar la taxonomía. Se identificaron 213 intervenciones estructurales: Acceso (65%), Política o procedimiento (32%), Medios de comunicación (29%), Estructura física (27%), Capacitación (24%), Movilización de la comunidad (9%) y Determinantes sociales de la salud (8%). Cuarenta por ciento había concentrado en poblaciones de alto riesgo (por ejemplo, personas que se inyectan drogas [12%]). Este artículo describe una taxonomía completa y bien definida de intervenciones estructurales con 7 categorías y 20 subcategorías. La taxonomía acomodado todas las intervenciones identificadas.
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Introduction
National HIV prevention goals [1] include the expansion of efforts to prevent HIV infection by using a combination of effective, evidence-based strategies. An updated, national goal [1] calls for adoption of structural approaches to reduce HIV infections and improve health outcomes in communities with high rates of infection as one of the steps to reducing HIV-related disparities and health inequities. Many public health outcomes are partly determined by individuals’ behaviors. Public health efforts to reduce the consequences of such behaviors often rely on appeals to individuals to change their behavior. However, other approaches have been developed and these strategies, one of which is referred to as “structural,” alter the environment in ways that facilitate or promote safer behaviors, or reduce risk in ways that do not rely on individual behavior change. Historically, major structural public health interventions have had large impacts.
Several HIV specialists have developed frameworks for classifying structural interventions for HIV prevention. However, they all consisted of a set of categories designed to be illustrative, rather than comprehensive. Sweat and Denison [2] proposed that behavior change interventions can produce change at any of four causal levels—individual, environmental, structural, and “superstructural”—and gave examples and change mechanisms for each. For example, superstructural interventions were defined as “macrosocial and political arrangements, resources, and power differences that result in unequal advantages.” Examples of such interventions might include “national and international social movements, revolution, land redistribution, war, and empowerment of disenfranchised populations.” Structural interventions were defined as “laws, policies, and standard operating procedures.”
Blankenship and colleagues [3] reviewed the literature available at the time and proposed nine categories of structural interventions based on contextual factors of availability, acceptability (e.g., campaigns shaming people committing unacceptable behavior, such as drug use), and accessibility. Similarly to the Sweat and Denison analysis, these authors gave examples of each at the individual, organizational, and environmental levels.
In the context of a special issue of AIDS resulting from a consultation organized by scientists (including the senior author of the current manuscript) at the Centers for Disease Control and Prevention (CDC), Sumartojo and colleagues [4] presented a table listing types of structural interventions (economic resources, policy supports, societal conditions, and organizational structures and functions) crossed with types of institutions (government, service organizations, private business, workforce organization, faith community, justice system, media, educational system, and the health care system) that could be a barrier or provide support. Again, these examples were not based on the extant literature, nor meant to be comprehensive.
In 2000, Cohen and Scribner [5] described four categories of structural interventions: Availability, Physical Structures, Social Structures, and Media Messages. In a later exposition by Blankenship and colleagues [6], structural interventions were categorized into four types: community mobilization, integration of HIV services, contingent funding, and economic and educational interventions; these four were largely mutually exclusive of the four specified by Cohen et al. [5]. Another such effort was undertaken by Tsai [7] who described structural interventions as existing along two dimensions: implementation intensity, and dependence of the effects on user agency. However, only a few examples were provided. Lastly, Kaufman and colleagues [8] noted stigma as an important factor that may influence HIV-related behavior. Other efforts at structural interventions to date have suffered the same issue of lacking comprehensiveness [9,10,11,12,13]. Moreover, a systematic process to categorize existing structural interventions was not attempted.
As we became immersed in the literature, we found the need for an all-inclusive framework to organize the different types of structural interventions. Therefore, we conducted a systematic review of the literature on structural interventions addressing HIV and developed a detailed and comprehensive taxonomy to enable categorization of every identified structural intervention. The purpose of this paper is to describe this new taxonomy in detail and to apply it to organize interventions identified through the systematic review.
Research Questions
This review addressed the following research questions:
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1.
What types of HIV prevention structural interventions are currently in the literature?
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2.
What are the outcomes of HIV prevention structural interventions?
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3.
Are there patterns in types of HIV prevention structural interventions? (Do certain types go together?)
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4.
What are the study designs of HIV prevention structural interventions?
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5.
Has the mix of HIV prevention structural interventions changed across time in terms of location, structural intervention type, research design, and population groups?
Methods
Search Strategy
To identify structural interventions in HIV prevention, we used CDC’s Prevention Research Synthesis (PRS) Project’s cumulative database (PRS database) of citations relating to HIV, AIDS and STI prevention literature from 1988 to 2013. Citations in this database are coded for a variety of variables related to populations, settings, interventions and outcomes. At the time of this project in 2013, the database contained more than 64,000 unique citations that were coded according to topics, target populations and types of interventions. This database is updated annually with automated searches [14] designed and tailored to four research areas: (1) HIV, AIDS, or STI behavioral prevention; (2) linkage to, retention in, and re-engagement in HIV care; (3) HIV, AIDS, antiretroviral therapy (ART) treatment and adherence; and (4) systematic reviews on HIV and AIDS. The automated searches use six electronic bibliographic databases to retrieve relevant published literature: CAB Global Health (OVID), CINAHL (EBSCOhost), EMBASE (OVID), PsycINFO (OVID), MEDLINE (OVID), Sociological Abstracts (ProQuest) [15,16,17,18]. In addition, there is a supplemental manual search, which includes a quarterly hand search of 52 journals, requesting publications from experts in the field and reviewing other sources, such as electronic mail lists, clinical trial databases (e.g., Cochrane Library, CRISP database), conference proceedings, and references harvested from relevant HIV behavioral prevention research literature [14]. Full search strategy details of databases searched, MEDLINE search strategy, and a list of hand-searched journals are provided in the online Supplementary Materials A, B, and C, respectively. Citations identified through automated and manual searches were downloaded and deduplicated in the PRS database before conducting title/abstract screening and full report coding.
To obtain citations for this project specific to structural interventions, the PRS database was searched for citations published between 1988 and March 2013 that were coded as (1) “structural intervention,” yield = 135 citations; or (2) “policy intervention,” yield = 38 citations; or (3) “structural change mechanism,” yield = 100 citations. A second search was conducted after the taxonomy was developed and included terms that were not in the original search. These coded terms included (1) “capacity building,” yield = 33 citations, (2) “community mobilization,” yield = 37 citations, and (3) “social marketing/mass media,” yield = 97 citations. The total citation yield from the PRS database was 440 citations, last searched on May 3, 2017. In addition, authors hand-searched reference lists of related reports and systematic reviews and identified 63 more citations. Thus, 503 potential papers were identified (see Fig. 1).
Inclusion Criteria
To be included in this review, studies were required to meet the following criteria:
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Evaluation of an intervention that included at least one structural component not controlled by the individual, affecting recipients’ behavior or other aspects of HIV risk
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Reported data on at least one of the specified outcomes (see list below in Outcome Measures)
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Published in English in a peer-reviewed journal
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Research design including a comparison condition, specifically:
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RCTs, cluster RCTs
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quasi-experimental, cluster quasi-experimental (defined here as comparison trials where treatment assignment is not random but also not self-selected)
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time series (requiring two or more observations before and after the intervention)
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prospective cohort studies
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retrospective cohort studies
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case–control studies
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before/after comparisons (including comparisons against a baseline of zero)
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Exclusion Criteria
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Interventions delivered at the community level unless there was an explicit structural component. Interventions were considered community level and not structural if the activity focused on individual participation or transactions, such as small group empowerment meetings or one-to-one conversations.
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Exposure analysis (i.e., only comparing people reporting exposure versus no exposure to an intervention)
Variables Abstracted
The following variables were abstracted: first author name, year of publication, years and location of implementation, target population, type of structural intervention, study design, outcomes measured, and description of intervention.
Outcome Measures
Studies were eligible for this review if they reported results on at least one of the following outcome measures:
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Sexual risk behaviors associated with HIV infection or STI (e.g., condomless sex, number of sex partners)
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Injection drug use behaviors (e.g., uptake of sterile syringes, frequency of injection drug use)
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HIV testing (e.g., number of people tested for HIV)
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HIV infection
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STI when used as a proxy for behavior change (i.e., excluding improved surveillance)
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HIV stigma
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ART prescriptions, when an outcome of provider interventions
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Adherence to HIV medication
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Engagement in HIV primary medical care (including health care utilization, linkage to and retention in care)
We excluded certain outcomes that we considered more distal to HIV infection. The outcomes excluded, or that did not qualify a citation for the review, were:
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Number of condoms distributed/taken
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Attitudes other than stigma
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Cognition including knowledge
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Communication
Procedure
We developed a definition for structural interventions through an iterative procedure of literature review and workgroup discussion. In 2010–2011, a team of experts reviewed the first 87 citations and developed an initial definition and taxonomy. In 2012, two coders were added to the project and independently coded the 87 citations by using the categories developed in the first step. The categories and corresponding definitions were further refined. All citations were coded by pairs of independent coders. Discrepancies were resolved through discussion by all team members.
Statistical Methods
Taxonomy categories and subcategories were analyzed using descriptive statistics and cross-tabulations. We used logistic regression to examine changes across time in the proportion of studies that featured various characteristics, specifically type of structural intervention, location (high versus middle/low income economies), type of study population, and study design quality (stronger versus weaker designs). In each model, the dependent variable was presence or absence of the characteristic of interest. The independent variable was year, so that the odds ratio (OR) represents the annual increase in odds that a study includes the characteristic of interest. For graphic presentation we grouped the 26-year review period into one group of 6 years followed by four groups of 5 years. SAS version 9.3 was used for the analyses.
Results
Structural Intervention Definition and Taxonomy Development
We defined structural interventions as:
An intervention that affects risk and/or behavioral choices by changing something that is external to the individual and not under his/her control.
The definition is broad enough to include interventions that operate in two distinct ways along separate continua to reduce risk: intervention target and proximity to HIV infection. The first dimension refers to whether an intervention targets changes in individuals versus environment. When the intervention alters the environment (e.g., storefront HIV testing centers) or uses strategies to alter the choice structure (e.g., routine opt-out HIV testing in clinical settings), these are outside the individual’s control. The second dimension refers to whether an intervention alters social determinants of the epidemic (e.g., microfinance interventions or reducing societal homophobia). We categorized all interventions along these two dimensions as illustrated in Fig. 2. Interventions are considered structural if they meet one or both criteria of being distal to the infection (e.g., social determinants of health) or targeting the environment. Thus, structural interventions fall into three of the four quadrants.
Interventions in Quadrant 1 are typically focused on changing individual behavior, knowledge, and awareness, and focused on proximal causes; these meet neither criterion, thus are considered not structural. Interventions in Quadrant 4 are considered structural as they meet both criteria (i.e., they target the environment rather than the individual and are focused on distal causes). Those in Quadrants 2 and 3 meet only one of the two criteria to affect change; however, these types of interventions were considered to be structural as well.
We next developed a taxonomy of structural interventions and refined definitions for each category in the taxonomy (Access, Policy/Procedure, Physical Structure, Capacity Building, Mass Media, Community Mobilization, and Social Determinants). Most of the categories had subcategories; all are defined below.
Taxonomy Definitions
Access
Provision of a health product or service or actions that make such products or services more readily available to the intended users. Access can be modified in ways that include, but are not limited to, physical changes. Examples include locating a storefront HIV testing site in a neighborhood or expanding its hours of operation. Condom distribution counts as access only if condoms are available widely and do not require enrollment into a program to procure. Subcategories of Access include HIV testing, Condoms, STI testing, Sterile injection equipment, HIV Health Care, and Drug treatment.
Policy/Procedure
Policy is formal guidance, principal, or rule adopted to bring about change. Procedure is the implementation of a policy and typically specifies a process. It is important to note that virtually all interventions require some policy or procedural change in order to be instantiated. Both are decided at an organizational or higher level that do require input at the individual level. Often, policy/procedure interventions are ones in which the change is the intervention itself.
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Institutional policy/procedure Policies enacted by a nonjudicial entity such as a clinic, school, or workplace that affect risk and/or behavioral choices (e.g., opt-out testing in an ER).
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Governmental policy For interventions in this category, there may not be legal consequences for infractions and they may be issued from a municipal, state, or national body (e.g., CDC guidelines on preexposure prophylaxis).
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Legislation Involves change in law that affect risk and/or behavioral choices (e.g., syringe access laws). Such changes have the authority of the polity behind them.
Mass Media
Widely disseminated interventions via a large-scale communication medium other than person-to-person.
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Social marketing The promotion of some positive social objective by employing marketing techniques used commercially; often disseminated via mass media (e.g., radio or TV spots delivering a crafted message). A requirement is that the information channel can be said to saturate the environment, so that exposure is largely outside the control of the individual (e.g., video shown to large waiting room; large posters displayed in multiple locations in a neighborhood). Small communication channels, such as letters, brochures, newsletters, and videos delivered to individuals or small groups, do not qualify as mass media.
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Narrative interventions Interventions focused on a storyline included in the media (e.g., soap operas, podcast serial dramas).
Physical Structure
Any physical form that affects risk directly or the ease with which healthy behaviors can be performed (e.g., creating new clinics, integrating services in one location, building a road, using a mobile van to deliver services).
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Integration of services Services or products are brought together (i.e., co-located) for the sake of the convenience of the intended user and the efficiency of service provision. This is an important subset of physical structure interventions.
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New physical structures Development of structures that did not exist previously, at least in the present location (e.g. clinics, vans, doors on bathhouse rooms).
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Service provided in nontraditional setting Health services made available to people in a particular setting (e.g., homes, workplaces, prisons, schools) and the original service provided in the setting is not related to health or located in a health setting.
Capacity-Building
Change that improves an agency’s ability to provide services or programs.
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Provider/supervisor training Training of health care or other staff to help them use more effective procedures with patients/clients.
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Technology Using tools to increase productivity.
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Hiring staff/funding Adding personnel to start interventions or increase productivity or securing monies to implement or enhance interventions.
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Staff incentives Providing inducements, either monetary or nonmonetary, to increase productivity.
Community Mobilization
A process of change involving multiple stakeholders within a community, including people who live in the community. A key criterion is that the community becomes involved through interaction with each other and the resulting change includes emergent properties, such as collective efficacy (e.g., commercial sex workers who unite together to demand condom use from clients). A substantial amount of the change is generated by community members who play a role in developing and implementing the intervention.
Social Determinants of Health Interventions
Interventions addressing survival or acceptance and respect.
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Survival Interventions that address factors having to do with basic necessities, such as money, food, and shelter, rather than, or in addition to, addressing HIV-related risk behavior directly.
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Acceptance and Respect Interventions that address prejudice, discrimination, HIV stigma, or homophobia in the social environment of those whose health and/or health behaviors are affected by them. Interventions aimed at reducing internalized prejudice do not necessarily count as structural interventions because they may directly influence only the affected individuals.
The categories are mutually exclusive with the exception of the Access category. Often, interventions in other categories provided access to things by their very nature, such as condoms, HIV testing, or sterile syringes, and thus meet the definition of the Access category. On the other hand, interventions can also be classified in more than one category when they have multiple components, such as an intervention that includes community mobilization of commercial sex workers in addition to a policy of 100% condom use. Most of the interventions in these categories fit into quadrants 3 or 4 in Fig. 2. Only interventions in the social determinants of health category may fit into quadrant 2 or 4.
Characteristics of Structural Interventions and Categorization using the New Taxonomy
Sample of Studies
From the 503 citations identified by the search, 213 intervention studies published between 1988 and 2013 met criteria and are therefore included in this review (Fig. 1, Appendix Table 6). The interventions were conducted between 1984 and 2010; more than half began in 2001 or later.
Type of Structural Intervention
The majority of interventions were categorized as Access (65%, n = 139) (Table 1); the most common Access types were HIV testing (n = 52), condoms (n = 48), and STI testing and treatment (n = 34). The next largest category was Policy/Procedure (32%, n = 68) with 51 studies employing institutional policies/procedures and 18 employing governmental. Twenty-nine percent of the interventions were developed as Mass Media interventions (n = 62), most of which included social marketing campaigns (n = 56). Five of the social marketing studies also included narrative interventions while six were narrative interventions only.
Twenty-seven percent of studies were categorized as a Physical Structure (n = 58), either by providing services in a nontraditional setting (n = 23), integrating services (n = 22), or developing a new physical structure (n = 20). Twenty-four percent of the studies featured Capacity Building (n = 51), most frequently through provider or supervisor training (n = 42) or new technology (n = 12). Nine percent of studies were categorized as Community Mobilization (n = 20) and eight percent of studies were considered to be Social Determinants of Health (n = 16).
There was a significant increase across time in the proportion of studies that included three SI types (Fig. 3). The proportion including Physical Structure increased from 13% in 1988–1993 to 33% in 2009–2013 (OR per year = 1.08, 95% CI 1.02, 1.14). The proportion including Policy and Procedure increased from 27 to 44% (OR 1.06, 95% CI 1.01, 1.11). The proportion including Social Determinants of Health increased from 0 to 14% (OR 1.24, 95% CI 1.06, 1.46). There was a significant decrease across time in the proportion of studies that included Mass Media from 47 to 14% (OR 0.91, 95% CI 0.88, 0.97). There was no significant change across time in the proportion of studies that included Access, Capacity Building, or Community Mobilization.
Intervention Location
The interventions were located in countries around the world (Table 2). The largest proportion (49%, n = 104) of studies were conducted in the Americas, most of them in the United States (n = 84); within the United States, the largest numbers were from the West (n = 30), Southeast (n = 16) and Northeast (n = 15). Twenty-four percent of studies were conducted in Africa (n = 52), including nine from Tanzania, eight from South Africa, and six from Uganda. Seventeen percent of the studies were conducted in Asia (n = 36) including nine each from China, India, and Thailand. Eight percent were conducted in Europe (n = 18), including nine studies from the United Kingdom and two each from France, Italy, and the Netherlands. Three studies were from Australia. In analyses examining change over time, there was no significant change in the proportion of interventions conducted in high income economies versus middle/low economies (OR 0.99, 95% CI 0.95, 1.04).
Target Population
Table 3 summarizes the target populations across the interventions. Forty percent of the structural interventions focused on high-risk populations, including 32 studies targeting commercial sex workers, 26 studies targeting individuals who inject drugs (PWID), and 17 studies targeting men who have sex with men (MSM). Several studies focused on females (n = 47), persons living with HIV (n = 32), youth (n = 30), people residing in urban/inner city areas (n = 26), young adults (n = 20), HIV clinic patients (n = 16), blacks or African Americans (n = 12), and Hispanics/Latinos (n = 8).
Fewer studies targeted homeless persons (n = 4), non-injection drug users (n = 4), pregnant females (n = 4), incarcerated persons (n = 4), or sexually active youth (n = 3). Only one study focused on transgender persons. There was a significant increase over time in the proportion of interventions focusing on persons living with HIV, from 7% in 1988–1993 to 30% in 2009-2013 (OR = 1.17, 95% CI 1.06, 1.28), and a significant decrease in the proportion of interventions targeting PWID, from 53 to 7% (OR 0.89, 95% CI 0.84, 0.95). There was no significant change across time in the proportion of studies focusing on commercial sex workers (OR 0.97, 95% CI 0.91, 1.03) or MSM (OR 1.00, 95% CI 0.92, 1.08).
Outcome
Sex behavior outcomes constituted the largest category of outcomes (50%, n = 106); condom use was the most frequent outcome in this category (n = 81) (Table 4). Testing or treatment outcomes were the next largest category (40%, n = 86); HIV testing (n = 60) was the most frequent type of testing/treatment, followed by retention in care (n = 13) and antiretroviral adherence (n = 11). Twenty-five percent of the interventions reported biologic outcomes (n = 53), which consisted predominantly of STI (n = 31) and HIV infection (n = 26). Other biologic outcomes included viral load/suppression, CD4 counts and AIDS mortality. There was a smaller proportion of drug injection behavior outcomes (13%, n = 28); among these, sharing of equipment or injection drug use were reported most frequently. There were only 5 studies with stigma outcomes (2%).
Type of Research Design
The majority of interventions was evaluated using before/after research design, either one group or cross-sectional (57%, n = 121), but other research designs of randomized controlled trials, quasi-experimental, and serial cross-sectional designs were also employed (Table 5). There was no significant change over time in proportion of high-quality study designs (i.e., RCT, cluster RCT, quasi-experimental and cluster quasi-experimental) versus low-quality study design (e.g., before/after designs or after-only designs) (OR 1.01, 95% CI 0.96, 1.06).
Discussion
Overall HIV incidence in the United States has remained stable despite increasing prevalence [19]. Several federal initiatives have been used to maintain or reduce new HIV diagnoses, the most recent of which is High Impact Prevention [20], a strategy to allocate resources on activities found to have the greatest impact in HIV prevention. Moving forward, the national HIV prevention goals [1] emphasize structural interventions as a way to reduce new HIV infections, thus it is timely to have a comprehensive framework for structural interventions. In this study, we developed a taxonomy of structural interventions comprising 7 categories and 20 subcategories, and classified 213 structural interventions into the new taxonomy. The new taxonomy is parsed similarly to Cohen et al. [5] and Blankenship et al. [6], but is more comprehensive than either taken singly and also includes social determinants of health (survival and acceptance). Blankenship et al. [6] included “community mobilization” and “integration of services,” which are also part of our own taxonomy. “Contingent funding,” while being sparse in the literature at the time we conducted our review, would be an example of using Social Determinants of Health-Survival, as would “economic development programs.” The category of “educational interventions” has more to do with site of delivery than type of intervention per se, and therefore does not appear in our taxonomy.
In earlier work, Blankenship and colleagues [3] proposed “availability” and “accessibility” categories, which are similar to our access category. Sumartojo and colleagues [4] included “economic resources,” which is similar to our category of social determinants of health-survival; “policy supports” is similar to our policy/process; and both “societal conditions” and “organizational structures and functions” encompass more than a single category in our taxonomy. Tsai [7], on the other hand, gave a few examples but none of them overlap with our categories. In summary, our taxonomy encompassed every structural intervention identified from the systematic review in HIV prevention and was built to be inclusive and comprehensive of interventions beyond the systematic review. Each category and subcategory has detailed definitions that were tested and refined during an iterative process. Moreover, since this taxonomy is broad, it is useful in presenting a wide variety of options to consider when choosing strategies that will best address the specific needs of a community.
Access, Policy/Procedures, Mass Media, and Physical Structure were the most common structural interventions identified in the literature. By contrast, interventions addressing social determinants of health were infrequently found in the HIV prevention and treatment literature. The largest proportion of the interventions were conducted in the United States but it is important to note that many of the interventions in low-middle–income countries were conducted by researchers from high-income countries. In general, the evaluation of the interventions consisted of before/after research designs and the rigor did not increase over time, possibly because it is often not feasible to randomly allocate structural interventions or study them in controlled situations.
While nearly 40% of the structural interventions focused on high-risk populations, interventions targeting MSM were relatively few compared to PWID and commercial sex workers.
Some structural interventions—namely, those addressing social determinants of health (both survival-related and tolerance/acceptance-related)—have the potential to influence multiple health conditions. Poverty, for example, is related to many health outcomes [21]. While conducting a microfinance intervention to address HIV risk alone may appear to be prohibitively expensive, a study assessing its effects on multiple health outcomes may demonstrate cost-effectiveness. Unfortunately, the disease-specific silos around which health promotion and illness prevention funding are organized make it difficult to conduct such studies. Thus, most interventions target intermediate structural factors associated with HIV and do not address fundamental contributors to health disparities, such as poverty, housing, and education. These contributors are termed frequently as “social determinants of health” and, for many health conditions, generally account for more variance in health than most factors and arguably more than individual behaviors [21]. Agencies that are capable of addressing these major structural determinants, such as US Departments of Housing and Urban Development (HUD), Labor (DOL) or Education (ED), do not necessarily focus on public health, but their programs are likely to have great impact on health outcomes. Evaluation of programmatic or policy interventions directed towards employment generation, school retention, or housing stability can be designed to examine effects on HIV and other health outcomes. It is often considered outside the reach of public health to intervene on these domains due to narrow organizational missions and vertical funding streams. However, with shrinking public health dollars, an HIV epidemic characterized by extreme disparities driven by social conditions, and the syndemic nature of infectious disease, chronic illness, substance abuse, and mental health, meaningful action-oriented collaborations that alter the fundamental causes of HIV and other health outcomes are needed urgently. Given the lack of integration between the health care system and other key non-health care systems, more of these collaborations from different arenas will be necessary.
It was a challenge to develop a definition for identifying that an intervention was truly structural and then to create a taxonomy that was able to encompass all structural interventions identified in our review. Our definition of structural interventions necessitates that exposure to the intervention is outside of the control of the person affected. For example, small-group interventions are not considered structural, as people self-select into group interventions and are thus in control of the receipt of the intervention. The distinction is that of personal agency (i.e., individuals controlling their own actions). We did include interventions that required some personal agency, as in the case of individuals using syringe exchange programs, because the environment is changed in a way that is not under the control of the involved person. By contrast, an example that would be excluded is a community-level intervention with no structural components. Even though these interventions are delivered in community settings, most also feature significant one-on-one transactions (e.g., Popular Opinion Leader and Community PROMISE) or small group risk-reduction meetings (e.g., Voices/Voces) [22,23,24]. Thus, interventions with a large reach do not necessarily meet the criteria as structural interventions unless the intervention entails an environmental change. Lastly, small communication media, such as brochures or pamphlets, even if they have a large reach, do not translate to structural change unless they change the environment.
Limitations
Our taxonomy may not be broad enough to apply to structural interventions reported for other health conditions. While we were highly inclusive in allowing less rigorously evaluated studies to be included, there are many interventions that are structural in nature that have not been evaluated. On the other hand, there may be some structural intervention evaluations not included in this study that report outcomes not directly related to HIV, but in theory could impact HIV risk. Lastly, we did not quantify the effectiveness of these interventions, nor did we assess in detail the quality of studies. Examining these dimensions in future studies will enhance the usefulness of the findings reported here.
Conclusions
To our knowledge, this is the first time a framework for structural interventions in HIV prevention has yielded a comprehensive, well-defined taxonomy of structural interventions. The taxonomy may move the field toward a more precise and shared language for discussing these types of interventions. It can be used to develop further generalizations about different types of interventions, as well as providing insight into the gaps in research in various categories within the taxonomy.
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Acknowledgements
We thank Lyle McCormick for data analysis; Mary Mullins and Julia DeLuca for conducting the original search in the PRS database and assisting with writing the search strategy section; and Tom Painter, Linda Kay, Juarlyn Gaiter who were involved in early process of defining structural interventions and operationalizing taxonomy. The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the U.S. Centers for Disease Control and Prevention.
Funding
This study was supported by the Prevention Research Branch, Division of HIV/AIDS Prevention at the U.S. Centers for Disease Control and Prevention and was not funded by any other organization.
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Sipe, T.A., Barham, T.L., Johnson, W.D. et al. Structural Interventions in HIV Prevention: A Taxonomy and Descriptive Systematic Review. AIDS Behav 21, 3366–3430 (2017). https://doi.org/10.1007/s10461-017-1965-5
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DOI: https://doi.org/10.1007/s10461-017-1965-5