Abstract
Hope is a positive, future-thinking construct that is highly related to pursuing and achieving our personal goals. Considering its relevance for well-being and psychological adjustment, the purpose of this study is to explore the psychometric properties of the Spanish version of the Dispositional Hope Scale (DHS) (Snyder et al. in Journal of Personality and Social Psychology, 60(4), 570–585, 1991), its relation with important psychological health indicators (depression, hopelessness, optimism, general self-efficacy and quality of life), and examine the possible differences between clinical (CP) and general populations (GP). Sample was composed of 290 volunteers. Measures of hopelessness, depression, optimism, quality of life, self-efficacy, and positive-negative affect were administered. Hope was assessed again 1 month later to collect test-retest data. CFA supports the unidimensional structure. In addition, good internal consistency and test-retest values were found. Further, based on the one-factor model, results revealed that the Spanish DHS has strong factorial invariance across populations (GP and CP). The differences in the hope levels detected between CP and GP appear to be mainly associated with positive affect and depressive symptoms. Results broaden the existing data about the Spanish DHS and support its usefulness not only for research, but also for clinical purposes.
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Introduction
Hope is an important variable in the pursuit and achievement of our goals. Hope means having the will and determination to accomplish our goals, and it also implies having the ability to use multiple strategies to reach them. According to Snyder et al. (1991), hope is a positive motivational state consisting of two distinct ways of thinking about our goals: Pathways thinking (the perception of personal abilities to generate routes to desired goals), and Agency thinking (the perception of one’s ability to initiate and continue the use of these routes). These two ways of thinking reinforce each other during the goal attainment process (Snyder et al. 2002). According to this definition, desired goals are a key element of hope and a cognitive component that anchors the hope theory (Snyder et al. 2002).
The concept of hope has been related to various benefits, and several studies have found a positive association between hope and well-being (Alarcon et al. 2013; Magaletta and Oliver 1999), life satisfaction, meaning in life (Feldman and Snyder 2005), psychological adjustment (Chang and DeSimone 2001; Moraitou et al. 2006), coping with illness (Affleck and Tennen 1996; Snyder et al. 2006; Stanton et al. 2002; Berendes et al. 2010; Kortte et al. 2012), and therapeutic improvement (Irving et al. 2004).
Snyder et al. (1991) developed both a theory of hope and a measurement instrument, the “Dispositional Hope Scale” (DHS), which has been highly employed in research, mainly as a measure of positive future thinking. This scale assesses dispositional hope, with the understanding that hope is not a goal-related state objectively defined by external sources, but rather an enduring disposition subjectively defined by people’s perceptions about their life goals and goal-related capabilities (Snyder et al. 1991). Based on their theory, the authors proposed a higher-order, two-factor model for this scale: agency and pathways (Snyder et al. 1991; Babyak et al. 1993). This scale has been translated and validated in different countries and with various types of samples (Abdel-Khalek and Snyder 2007; Chen et al. 2009; Gana et al. 2013; Kato and Snyder 2005; Marques et al. 2014; Shehni-Yailagh et al. 2012; Sun et al. 2012; Creamer et al. 2009; Roesch and Vaughn 2006; Vernberg et al. 2005). In all cases, the two-factor structure proposed by Snyder et al. (1991) was confirmed and showed convergent validity with other variables (self-esteem, optimism, self-efficacy, satisfaction with life, distress, hopelessness, depression, anxiety, among others). Moreover, the reliability generalization of the internal consistency and test-retest values of the DHS was analyzed, obtaining support for its reliability scores (Hellman et al. 2013).
Despite the extensive support found for the two-factor model, some authors have proposed a unidimensional model for this hope scale. Brouwer et al. (2008) argued that all items measure the same construct, a general hope factor, and recently, Galiana et al. (2014) also proposed a mono-factorial model for the DHS in a Spanish population.
Galiana et al. (2014) published the first presentation and validation of a Spanish version of the DHS, offering evidence of adequate psychometric properties. Their study assessed DHS dimensionality, internal consistency and nomological validity with life satisfaction and spirituality measures. However, this study was conducted only with Spanish university students and does not present evidence of the stability of the scale. Therefore, the aims of the present study are: a) to assess the factorial structure of the Spanish version of the scale (bidimensional or unidimensional) in general and clinical populations; b) to analyze the factorial invariance of the scale between clinical and general populations; c) to examine the possible differences in hope between clinical and general populations; d) to assess the relationships between hope and depression, hopelessness, optimism, general self-efficacy and quality of life; and e) to analyze the internal consistency and test-retest reliability of the Spanish version of the DHS.
Methods
Participants
The total sample was composed of 290 Spanish-speaking volunteers (249 women, 41 men), 168 participants from the general population (GP) and 122 from a clinical population (CP) (see Table 1 for demographic characteristics). GP were recruited through online platforms, and CP were individuals seeking treatment for psychological disorders (n = 22) or emotional problems related to medical conditions (n = 100). CP were recruited from the Psychological Assistance Service at the university and from an online patient platform.
Translation of the Adult Dispositional Hope Scale (DHS)
Given that this study began before Galiana et al. (2014) was published, a Spanish translation of the scale was carried out. First, a native Spanish speaker with a high level of English who was aware of the objective of the study translated the DHS into Spanish. Then, a native English speaker who had a fluent level of Spanish, but was not familiar with the DHS, performed a back-translation from Spanish to English. Any discrepancies between the Spanish and English translators were resolved by agreement. The Spanish version was judged to be an accurate translation of the original English version. When our Spanish DHS version was compared to the Galiana et al. version of the scale, some differences in wording were detected. However, all items refer to the same content and intention. Only item #12 shows a slight deviation from the Galiana et al. version (difference in the verb tense used).
Measures
Dispositional Hope Scale (DHS, Snyder et al. 1991)
This is a self-report inventory composed of 12 items (Agency = 4 items; Pathways = 4 items; Fillers = 4 items), with an 8-point Likert-type response scale ranging from 1 (definitely false) to 8 (definitely true).
Beck Depression Inventory II (BDI-II, Beck et al. 1996, Spanish Validation by Sanz et al. 2003)
This is one of the most widely-used self-report instruments to assess depression. This inventory includes 21 items that evaluate cognitive, behavioral, affective and somatic symptoms of depression during the past two weeks. In the current sample, Cronbach’s α was .96.
Beck Hopelessness Scale (BHS, Beck et al. 1974; Spanish Version, Aguilar et al. 1995)
This is a 20-item self-report inventory that reflects the respondent’s negative expectations. The response format is dichotomous; each item is either true or false in describing the respondent’s attitude during the past week. To control for acquiescence, 9 items are keyed false, and 11 are keyed true. The scale has demonstrated acceptable psychometric properties. In the current sample, internal consistency coefficients were high, Cronbach’s alpha, α = .82.
General Self Efficacy Scale-12 (GSES-12, Bosscher et al. 1997; Spanish Version, Herrero et al. 2014)
This is a 12-item scale that evaluates perceived global self-efficacy and three main aspects of it: initiative, persistence and effort. All items are responded to on a 5-point scale, ranging from 1 (never happens to me) to 5 (always happens to me). This inventory has shown good psychometric properties (Woodruff and Cashman 1993). In the current sample, Cronbach’s α for the total scale was .82. The Initiative subscale has an α = .73, Effort has an α = .76, and Persistence has an α = .78.
Positive and Negative Affect Schedule (PANAS, Watson et al. 1988)
It includes 20 items that evaluate positive (10 items) and negative (10 items) affect on a 5-point scale. Respondents indicate, in general, how they usually feel. Cronbach’s α were: .89 for positive affect and .87 for negative affect.
Life Orientation Test-Revised (LOT-R, Scheier et al. 1994; Spanish Version: Perczek et al. 2000)
This is the most widely-used self-report instrument to assess individual differences in generalized optimism (general future expectations), and it includes 10 items (4 fillers) with a 5-point response scale. Cronbach’s α was .67.
Quality of Life Index (QLI-Sp, Spanish Version, Mezzich et al. 2000)
It consists of 10 items that evaluate physical, psychological and emotional well-being, as well as social and occupational functioning, including an overall perception of quality of life. This scale assesses quality of life at the present. All items are responded to on a 10-point scale. The index presents good psychometric properties. Cronbach’s α was .92.
Procedure
Participants were informed that the study was voluntary and confidential, and they signed a consent form stating their willingness to participate. No particular inclusion or exclusion criteria were established, and no incentive was offered for participation. Data were collected from 2009 to 2013 for both the GP and CP samples.
The GP subsample was recruited online. A link to the study was published in different forums and public social networks. Participants in the CP subsample filled out all the instruments individually in an assessment session. Two scales were not assessed in the entire sample: hopelessness was only assessed in GP and self-efficacy was only evaluated in CP. Participants were contacted 1 month after the first administration of the DHS and asked to complete it again, in order to collect data on the test-retest reliability.
Data Analysis
Confirmatory Factor Analysis (CFA) was performed to test previous models found in the literature, using the Mplus program, version 7. The missing data were treated with the Expectation Maximization Algorithm method (using SPSS 17.0). The following recommended goodness-of-fit indices were used: a corrected Satorra–Bentler chi-square (S-B χ2), the Comparative Fit Index (CFI), the Standardized Root Mean Squared Residuals (SRMR) and the Root Mean Squared Error of Approximation (RMSEA). The following criteria were used to indicate the fit of the CFA models to the data: CFI ≥ 0.90, SRMR ≤0.08 and RMSEA ≤0.06 (Hu and Bentler 1999). Besides, to compare the models, S-B Chi-Square differences were took into account.
Factorial invariance across groups (GP and CP) was calculated. Specifically, configural, metric, scalar and strict measurement invariance were estimated through multi-sample analyses. Descriptive statistics of the total score for the DHS were calculated for the GP and CP. Internal consistency of the Spanish DHS was assessed using Cronbach’s and split-half coefficients. In addition, the temporal stability of the data and the discriminant and convergent validity were also calculated using correlation coefficient analysis. Criterion validity of the Spanish DHS was examined by calculating its correlation with measures of depression, self-efficacy, positive and negative affect, optimism, hopelessness and quality of life.
Results
Confirmatory Factor Analysis
CFA was used to test the 4 competing models: a model with a mono-factorial structure (model 1), a model with 2 correlated first-order factors (model 2), a model with 2 related first-order factors with one superordinate higher-order factor (model 3) and a bifactor model (model 4).
In general, fit indices were adequate for the four models tested (see Table 2). Taking into account that S-B chi-square differences between the models were not significant -and therefore all models fit equally well statistically- the simplest model was selected (unidimensional). Figure 1 shows the Final factor solution for the Spanish Dispositional Hope Scale.
Reliability: Internal Consistency and Test-Retest
Internal consistency coefficient (Cronbach’s alpha) for the total scale was excellent (.89). Comparing our results with the original English study and to the Galiana et al. Spanish DHS study, Cronbach’s alpha was higher (original version: from .74 to .84; Galiana et al. version: .83). Additionally, the split-half reliability coefficient was acceptable (.87). Regarding time stability, test-retest analyses were conducted only with GP; the reliability value for the total score was .80.
Factorial Invariance Across Groups
A forward multistage procedure was used to test factorial invariance of the Spanish DHS across GP and CP groups. An acceptable baseline model for both groups was found (see Table 3). Then, invariance of the factor loadings, intercepts and the residual variances across both groups were tested (see Table 4). Multi-sample analysis showed a strong factorial invariance of the scale, with invariant factorial loadings and partially invariant intercepts (free intercepts of items 6, 8 and 9) (Model 2P).
Differences between Clinical and Non-Clinical Groups
Chi square and T tests were conducted to compare the sociodemographic and psychological characteristics of the two subsamples. Regarding sociodemographic characteristics, significant differences were found for sex and age. The CP group includes a smaller proportion of men (3.3 % vs 22 %) (X2(1, N = 290) =20.458, p < .001, V = 0.27) than the GP, and CPs are older than GPs (44.3 years vs 27.9 years old; (t(282) = −13.180, p < .001, d = −1.52). Moreover, significant differences were detected in marital status and educational level. Most of the GPs were single (81.5 %) and had a superior educational level (81 %), while a large percentage of CPs were married (58.2 %) (X2(3, N = 290) =96.972, p < .001, V = 0.58) and had a basic educational level (46.4 %) (X2(2, N = 290) =108.674. p < .001, V = 0.71). In the case of the psychological variables, significant differences were found in quality of life (t(137) = 10,517; p < .001, d = 1.78), positive affect (t(145) = 4861; p < .001, d = 0.82), and optimism levels (t(179) = 5533; p < .001, d = 0.87). CPs obtained lower values than GPs on all these measures. In addition, CPs obtained significantly higher levels of depressive symptomatology (t(132) = −5714; p < .001, d = −0.79).
Regarding hope scores, significant differences were found between both groups. GPs perceived themselves as more capable of creating routes to their desired goals, and they showed more goal-directed energy to initiate and continue the use of these routes, compared to the CP group (X = 52.38, SD = 7.22 vs X = 45.07, SD = 9.96; t(208.9) = 6897; p < .001, d = 0.84).
Taking into account the differences in age, sex, marital status and educational level found between the two groups, these variables were included as covariables to control their influence. After this step, the differences between GPs and CPs on hope scores remained significant (p < .001). However, when positive affect, quality of life, optimism and depressive symptoms were included as covariables, significant differences in hope scores between CPs and GPs became diluted (see Table 5). Positive affect and depressive symptoms showed a significant effect on hope scores, and so the differences previously detected in total hope have to be attributed to these variables.
Correlation Analyses
Correlation coefficients in GP are summarized in Table 6. General Hope scores were strongly associated with all measures in the expected direction (positive and significant relationship with optimism, quality of life and positive affect, and inversely correlated to depression, hopelessness and negative affect) For each correlation value, standard Z’ scores were calculated to compare them to the CP correlation scores.
Correlation coefficients in CP are summarized in Table 7. Results were similar to those obtained in the GP group but, although statistically significant, the correlation scores were lower than those obtained in the GP group.
Discussion
The first aim of this paper was to evaluate the factorial structure of the Spanish version of the DHS in general and clinical Spanish populations. Our factorial findings are in line with the previous analysis of a Spanish DHS (Galiana et al. 2014), which proposed a one-factor solution. Taking into account this previous work and the present outcomes, it is possible to suggest that a “global” hope construct is a better approach for Spanish population, instead of a more differentiated one, as the model originally proposed by Snyder (two-factor structure with one higher-order factor). Furthermore, we demonstrated that the Spanish version of DHS has a strong factorial invariance between populations, so it is possible to support the premise that this unidimensional model of hope is applicable not only to general population but also for clinical population. It is necessary, however, to consider that three items were released when factorial invariance was tested (numbers 6, 8 and 9), which indicates that both populations does not respond in the same manner to them. These items are: “I can think of many ways to get the things in life that are most important to me” (item 6, Snyder’s Pathways), “Even when others get discouraged, I know I can find a way to solve the problem” (item 8, Snyder’s Pathways) and “My past experiences have prepared me well for my future” (item 9, Snyder’s Agency). This highlights that although the “global” hope scores of both populations are comparables, these are populations with quite different characteristics, and therefore future studies should replicate these findings and explore the presence of bias in these particular items with bigger clinical and general samples.
Regarding internal consistency, high values were obtained and adequate time stability index was also observed, an important psychometric property for a dispositional measurement, and one not previously assessed with the Spanish DHS. Regarding criterion validity, significant correlations were found between the DHS and measures of depression, hopelessness, positive and negative affect, optimism, general self-efficacy and quality of life.
Differences were detected between CP and GP in their hope scores. Previous studies with chronic medical conditions (our most prevalent type of CP) have described variations in hope related to illness symptoms (e.g., pain and fatigue in cancer patients), psychological distress (like depression) and personal resources, such as self-efficacy (Berendes et al. 2010; Venning et al. 2007). In addition, dispositional hope has been found to behave differently from optimism (Affleck and Tennen 1996). The outcomes obtained in the present study suggest that the low hope scores detected in the CP were mainly associated with their low positive affect and high depressive symptoms, and not with their low optimism scores. This finding is in line with previous research and with the relevance of well-being and psychological distress in this population. Taking into account that the CP group included in this study was not only composed of medical conditions, it would be necessary to corroborate these findings in a homogeneous CP sample. Moreover, it would be relevant to continue to explore the variables that could help to maintain hope levels in chronic medical contexts, and to determine whether these variables are acting on “state” or “dispositional” hope levels.
Several limitations of the study should be considered. First, the greater proportion of women in our sample limits the generalization of the results. Second, the composition of the clinical group is not balanced, with medical conditions prevailing (fibromyalgia and cancer). Given the limited size of this group, it was not possible to analyze the data considering each diagnosis (medical and psychological conditions). Future studies with larger samples of clinical populations should compare these groups in terms of hope, self-efficacy and optimism levels, and corroborate the present results. Third, test-retest analyses were not conducted with clinical population, and therefore it is not possible to conclude about the stability of the scale in this population.
In spite of these limitations, the results obtained in the present study broaden the existing data about the Spanish DHS, and they support the use of this scale in both general and clinical Spanish populations, showing its usefulness not just for research but also for clinical purposes.
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Acknowledgments
This study was funded in part by the Excellence in Research Program PROMETEO II (Generalitat Valenciana. Conselleria de Educación, 2013/003), ‘CIBER of Physiopathology of Obesity Nutrition, an initiative of ISCIII (ISC III CB06 03/0052) and PROMOSAM Excellence in Research Program (PSI2014-56303-REDT). MINECO. Spain.
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Espinoza, M., Molinari, G., Etchemendy, E. et al. Understanding Dispositional Hope in General and Clinical Populations. Applied Research Quality Life 12, 439–450 (2017). https://doi.org/10.1007/s11482-016-9469-4
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DOI: https://doi.org/10.1007/s11482-016-9469-4