Validation of a Spanish translation of the Gratitude Questionnaire (GQ-6) with a Chilean sample of adults and high schoolers
© Langer et al. 2016
Received: 21 April 2015
Accepted: 10 March 2016
Published: 31 March 2016
Recent studies have associated positive emotions with several variables such as learning, coping strategies or assertive behaviour. The concept of gratitude has been specifically defined as a tendency to recognise and respond to people or situations with grateful emotion. Unfortunately in Latin America, no validated measures of gratitude on different populations are available. The aim of this study was to analyse the psychometric properties of the Gratitude Questionnaire (GQ-6) in two Chilean samples.
Two studies were conducted: the first with 668 high school adolescents (390 women and 278 men, with ages ranging between 12 and 20, and a mean age 15.54 ± 1.22) and the second with 331 adults (231 women and 100 men, with an average age of 37.59 ± 12.6). An analysis of the psychometric properties of the GQ-6 scale to determine the validity and reliability of the instrument in Chilean adolescents and adults was performed. Bivariate correlations, multiple regression analyses, exploratory factor analysis (EFA) and Monte Carlo simulations were carried out. Finally, a confirmatory factor analysis (CFA) was performed.
A single-factor solution was found in both studies, a 5 item version for the adolescents and 6 items for adults. This factorial solution was invariant across genders. Reliability of the GQ was adequate in both samples (using Cronbach’s alpha coefficient). In addition convergent and discriminate validity were assessed. Additionally, a negative correlation between the GQ-5 and depression in adolescents and a positive correlation between the GQ-6 and happiness in adults was found.
The GQ is a suitable measure for evaluating a person’s disposition toward gratitude in Chilean adolescents and adults. This instrument may contribute to the advancement of the study of positive emotions in Latin America.
Research on gratitude has flourished in recent years. Gratitude has been defined as ‘a generalized tendency to recognize and respond with gratefulness to the role of other people’s benevolence in the positive experiences and outcomes that one obtains’ .
There is a growing body of empirical evidence about the relationship between gratitude and other health-related variables. In a recent study  a negative relationship was found between gratitude and depressive symptoms, and this relationship was mediated by other positive emotions and the tendency to positively reframe negative situations. Other authors  tested a causal model where gratitude seemed to directly foster social support and protect people from stress and depression. Gratitude has also been positively associated with personality traits such as agreeableness, responsibility, and extraversion, and negatively associated with neuroticism [1, 4].
In adolescents, gratitude has been associated with prosocial behaviour, social integration, and life satisfaction . There were also several studies that support the link between gratitude and satisfactory social relationships [6–8]. Additionally, other studies suggested that gratitude correlated with positive emotions like vitality, subjective happiness, hope, and optimism, and also with well-being and life satisfaction, both in adults and adolescents [1, 9–12]. However, to date no studies have explored the relationship between prototypic symptoms of eating disorders and gratitude in adolescents. Assessing this relationship is relevant because eating disorders constitute a relevant risk factor for developing serious health problems and psychopathology in adulthood and their onset usually occurs during adolescence [13, 14]. Therefore, in terms of promoting mental health it is important to explore whether positive emotions such as gratitude are negatively associated with eating disorders.
Gratitude-based interventions constitute another important research area in this field, serving two main purposes. First, to raise awareness about gratitude as a key component in the promotion of wellbeing in both adults and adolescents [12, 15]. Second, to assess the extent to which gratitude-based interventions could enhance gratitude levels in different populations , which would suggest that gratitude is a dispositional quality that may be cultivated and developed [3–8].
Several instruments have been designed to measure gratitude, including: The Gratitude Resentment and Appreciation scale (GRAT; 44 items; , and its abbreviated version (16 items; ; The Gratitude Adjective Checklist (GAC);  which is used to measure gratitude as an emotion, mood, or disposition; The Gratitude Questionnaire-20 items (G20); ; and The Gratitude Scale , which consists of 18 items that express favourable, neutral, and unfavourable affirmations toward gratitude. However, the most widely used questionnaire which has been validated in several countries, is the Gratitude Questionnaire (GQ- 6) , comprising six items.
The GQ-6 is a self-report questionnaire designed to assess individual differences in people’s disposition to experience gratitude in everyday life. Some authors  considered gratitude as an affective trait they named grateful disposition. The authors initially developed 39 items (including positive and negative ones) with statements about experiences and expressions of gratitude and appreciation in daily life, among others. Through a series of exploratory and confirmatory factor analyses they developed a robust single factor scale and retained only 6 items that scored high on the first factor, each of them measuring a unique aspect of the grateful disposition. The studies carried out for developing the instrument were conducted with adult and young populations (older than 18), presenting adequate construct validity and reliability [1, 18].
In terms of studies with younger populations (university students and adolescents), one of the most significant adaptations was removing item 6 (“Long amounts of time can go by before I feel grateful to something or someone”) which showed low correlations with the instrument as a whole. For example, in the Taiwan  and Turkey  GQ-6 validations a 5-item model was found to have a better fit compared to the original 6-item model. Both adaptations showed satisfactory reliability with Cronbach's alphas of .80 and .77, respectively. Froh et al.  confirmed these findings in a study that examined whether the GQ-6 (along with the GRAT and GAC) were valid in a sample of adolescents (ages between 10 and 19). The authors reported that the scale presented acceptable internal consistency with alphas higher than .70, and positive correlations between the GQ-6, the GAC and GRAT for all ages, with weaker correlations at younger ages (10 to 13). Regarding Spanish-speaking countries, a preliminary validation of the instrument was carried out with 369 Chilean university students . The results showed a single factor solution with the six items and an adequate reliability (Cronbach’s alpha = 0.74).
To date, the Chilean validation of GQ-6 has been carried out only with a relatively small sample of young people in Chile, but without confirmatory analysis to make the measure more robust. It is still unknown how the instrument behaves in adolescent populations and in adults in Chile. To address this gap and to test the generalizability of previous findings in gratitude research, cross-cultural and international samples are needed. Thus, the purpose of this study is to validate the GQ-6 in both adult and adolescent populations in Chile. To accomplish this, two studies were conducted: Study 1 with high school adolescents, and Study 2 with adults from the general population.
Methods of study 1
The sample consisted of 668 high school students of subsidised-private and paid-private educational institutions of the Metropolitan Region of Santiago, Chile. Schools were selected by convenience sampling and participants from a volunteer sample. Because 3 students dropped out of the study, the final sample consisted of 665 students.
Three hundred and ninety participants were women and 278 were men, with ages ranging between 12 and 20, and a mean age of 15.54 years (SD = 1.22). While 35 % of the participants were in the first year of middle school, 29.6 % were in the second year, 23.7 % in the third year, and 11.7 % in the fourth year.
The Gratitude Questionnaire (GQ-6)
The GQ-6  is a self-report 6-item scale which assesses individual differences in the tendency to experience gratitude in daily life. Responses range from 1 to 7 on a 7-point Likert-type scale (1 = strongly disagree and 7 = strongly agree). Internal consistency of the instrument ranged between alphas of .76 and .87 [1, 18] (see Additional file 1).
The Beck Depression Inventory (BDI-I)
The BDI-I  is a self-report 21-item scale which assesses the presence and severity of depressive symptoms. The items are geared towards detecting the cognitive rather than the somatic-vegetative component of depression. Each question has 4 possible answers, assessing the severity and intensity of each symptom, and the total ranges from 0 to 63. Its psychometric properties have been studied exhaustively, showing good internal consistency. In the present study, internal consistency was good, with Cronbach’s alpha of .88.
The Eating Attitude Test (EAT-26)
The EAT-26  is an abbreviated version of the EAT-40, a self-report scale which aims to identify typical symptoms and concerns related to eating disorders in non-clinical populations. This test has been used as a screening device to determine eating disorders risk in schools, colleges, and other special risk groups, becoming one of the most widely used standardised tests in the field of eating disorders, with high levels of reliability and validity. The scale presented good psychometric properties in a Chilean simple  and a Cronbach’s alpha of .88 was found in the current sample.
The current validation of the Chilean version of the GQ-6 is part of a larger project called “Early detection and treatment of emotional problems in Chilean adolescents and young adults”. The original English version of the GQ-6 was translated from English into Spanish and then back to English using the guidelines proposed by Muñiz and Hambleton  for a back-translation method.
This study was approved by the School of Psychology Ethics Committee of the Pontifical Catholic University of Chile. Students were invited to participate voluntarily in this research, and a signed informed consent from them and their parents or tutors were required to participate. Computer-based questionnaires were collectively applied to groups of no more than 20 students during the school day in the computer laboratories of each educational institution. Each application took approximately 35 minutes and was supervised by a researcher who responded to questions and comments from students. The GQ-6, BDI-I and EAT-26 questionnaires were digitised using a web application specifically designed for a larger project in Chile (For details please see: www.myschool4web.cl).
An analysis of the psychometric properties of the GQ-6 scale was performed to determine the validity and reliability of the instrument in Chilean adolescents and adults. An Exploratory Factor Analysis (EFA) using maximum-likelihood was applied on the items of the GQ-6. Similarly to the procedure followed in the Dutch validation of GQ-6, parallel analyses with Monte Carlo simulations were conducted to determine the number of factors to retain in the EFA . Confirmatory factor analysis (CFA) for the single-factor model of the GQ-6— multivariate normality test was verified through Mardia’s coefficient. In addition, an analysis of invariance by gender was conducted. Cronbach’s alpha coefficient was used as a measure of reliability. Regression and correlation analyses were performed to test for convergent and divergent validity. Statistical analyses were performed using SPSS v. 21 and AMOS v. 21.
Exploratory factor analysis of the one-factor solution by principal components and with varimax rotation
1. I have so much in life to be thankful for.
2. If I had to list everything that I felt grateful for, it would be a very long list.
3. When I look at the world, I don’t see much to be grateful for.
4. I am grateful to a wide variety of people.
5. As I get older I find myself better able to appreciate the people, events, and situations that have been part of my life history.
6. Long amounts of time can go by before I feel grateful to something or someone.
Monte Carlo parallel analyses from the items of the GQ-6 in adolescents (study 1) and adults (study 2)
Variance explained (%)
After the exploratory analysis, a CFA was conducted. Given that the Mardia coefficient for the CFA was low (19.041), the maximum likelihood method was used to analyse the correlation matrix. To accept or reject the models tested, a combination of goodness of fit indexes were utilised: χ 2/df, CFI (Comparative Fit Index), TLI (Tucker Lewis Index), IFI (Incremental Fit Index), RMSEA (Root Mean Square Error of Approximation), plus its confidence interval at 90 %, and SRMR (Standardised Root Mean Square Residual). Given that χ 2 is very sensitive to sample size , χ 2/df was used. A quotient of 4 is considered a reasonable adjustment, while values close to 2 are considered as very good .
Goodness of fit indexes for model 1 (6 items) and model 2 (5 items)
RMSEA (CI 90 %)
Analysis of invariance by gender (GQ-5)
Cronbach’s alpha for the Chilean version of 5 items was .726, showing an adequate internal consistency for the instrument .
The relationship between GQ-5 items and the BDI-I (depressive symptoms) and EAT-26 (risk of eating disorder) scores was examined using Pearson’s correlation coefficient for the total sample of adolescents. GQ-5 scores were negatively correlated with BDI-I scores (r = − .345; p < .01) and with EAT-26 scores (r = − .106; p < .01).
Correlations and regression between gratitude in adolescents and mental health outcomes
BDI depressive symptoms
EAT-26 risk of eating disorder
Methods of study 2
The sample consisted of 331 Chilean adults, of which 231 were women, with an average age of 37.59 years (SD = 12.6). Participants were selected by convenience sampling.
Gratitude questionnaire (QG-6)
See the description in study 1.
Positive and Negative Affect Schedule (PANAS)
PANAS  is a 20-item scale, 10 items assessing positive affect, and 10 negative affect. The items consist of words that describe different feelings and emotions. The first Spanish validation was conducted by Sandin et al. . The most recent work and the one used here was developed by De la Rubia  in a Mexican population.
Depression, Anxiety and Stress Scale (DASS-21)
The DASS-21  has 21 items answered on a 4-point Likert scale (0 = Does not apply to me at all, to 3 = Applies to me very much or most of the time). It is divided into three subscales (with seven items each): depression, anxiety and stress. We used the Chilean validation published by Antúnez and Vinet . The results showed that levels of internal consistency for the subscales of the DASS-21 were .85 for the depression subscale, .73 for anxiety subscale, .83 for stress, and for the total score of the DASS-21 a Cronbach’s alpha of .91.
Subjective Happiness Scale (SHS)
The SHS  evaluates self-perceived happiness. This scale consists of four items utilising a 7-point Likert scale. In the initial Chilean validation , the subjective happiness scale showed acceptable to good internal consistency with Cronbach’s alphas of .73 in adults and .76 in college students. Test-retest reliability showed a relatively low correlation of .61, which might have been influenced by the relatively long gap between both measures (8 weeks). Factor analysis and Varimax rotation for each sample obtained a unique factor, consistent with the English version of this test.
The validation of the scale for gratitude is part of a larger project entitled: ‘Investigating compassion, gratitude and happiness’. This study is a collaborative project developed between different researchers involved in RedMindfulness, an online network where Spanish-speaking people interested in the practice of mindfulness interact.
All members of the network (about 2000 people) were invited to participate by email. People who were interested were invited to answer an online questionnaire, which was accompanied by a letter of informed consent. In two months 513 people responded, corresponding to 16 different countries; 331 people were Chileans, which corresponded to 64.5 % of the total sample. This study was approved by the Ethics Committee of the Adolfo Ibáñez University.
See the description of data analysis in Study 1.
As in Study 1, an EFA using Principal Components with the GQ-6 was conducted. Data yielded a Bartlett’s coefficient of 953.846, with a p-value less than 0.001 and a KMO of .854, confirming the appropriate use of factor analysis. Anti-image correlation values for individual items were all ≥ 0.74, which is well above the acceptable limit of 0.50. The communalities of the items were adequate (>0.3). The analysis extracted a single factor that explained 59.18 % of the variance in the data. Parallel analysis with Monte Carlo simulations showed a single-factor solution with 6 items (see Table 2).
Analysis of invariance by gender (GQ-6)
Cronbach’s alpha was .832, showing a good internal consistency for the instrument .
Convergent and divergent validity
Correlations and regression between gratitude in adult and mental health outcomes
PANAS Negative affect
PANAS Positive affect
R2 (Total DASS-21) = .303
R2 (Total PANAS) = .208
R2 (Total SHS) = .429
The factors of DASS-21 scale show that depression, anxiety, and stress are negatively associated with gratitude explaining the 30 % of the variance.
The factors of PANAS scale show that positive and negative affect are associated (positively with positive affect and negatively with negative affect) with gratitude explaining the 21 % of the variance.
Subjective Happiness Scale: regression analysis showed that subjective happiness factor predicts or is associated positively with gratitude in adults explaining the 43 % of the variance.
The goal of these studies was to validate the Chilean version of the Gratitude Questionnaire (GQ-6) in a sample of Chilean adolescents and adults. As far as we know, this is the first study to present the psychometric proprieties of the GQ-6 for a sample of non-English speaking adolescents and adults of the general population.
On regard to adolescents, in terms of construct validity, the results showed (through CFA) that the best factorial model was one-factor with five items. This solution was consistent with previous GQ-6 validations with adolescents from the USA  university/university students from Taiwan and Turkey [9, 19]. The fit of the five-item version of GQ was also confirmed by qualitative findings: adolescents showed difficulties understanding the meaning of item six. More specifically, it seems that the wording of this item might not be fully apprehended by younger participants . In addition, the GQ-5 presented a similar reliability to those reported in the studies mentioned above, with Cronbach’s alphas between .70 and .80.
Study 1 also found appropriate divergent validity of the GQ in relation to psychopathological measures, such as depression (assessed with the BDI-I). These results confirmed that gratitude, as a positive emotion, is negatively associated with depressive symptomatology in adolescents [20, 41]. However, the correlation between gratitude and eating disorders was very weak.
As mentioned above, our rationale to add the EAT-26 scale was that behaviours related to eating disorders constitute relevant risk factors for developing serious health problems and psychopathology in adulthood, and its onset usually occurs during adolescence [13, 14]. But our analysis did not find a relationship between eating disorders (measured by EAT-26) and gratitude. The hypothesis that gratitude may act as a buffer and protective factor for eating disorders should be further studied.
In Study 2 with adults, we found more robust results, with higher reliability and a higher percentage of the variance explained by the model [1, 18]. In other words, the results suggested that the younger the participants, the less reliable and lower capacity of the instrument to assess the disposition of gratitude [9, 19, 20]. Nevertheless, correlations between gratitude and other variables (e.g., optimism, happiness, well-being, spirituality or personality traits) were essentially the same in adults and in university students , but in adolescents, these correlations were relatively lower (e.g., between gratitude and positive and negative affect, and life satisfaction . These outcomes were confirmed in the present study. For instance, in Study 2, a positive moderate to strong correlation was found between gratitude and happiness (as measured by SHS), but lower negative correlations were found with the risk of eating disorders for adolescents (Study 1).
Study limitations and strengths
The limitations of these studies include the fact that, in contrast to the adult sample study, it was not possible to assess the convergent validity of the GQ-5 in the adolescent sample. Therefore, future studies will have to explore the question if gratitude is positively related to happiness, optimism, life satisfaction, positive affect, among other relevant constructs [9, 19]. Also, the five item version of the GQ was found in others’ validations and confirmed by CFA in this study, but this version was not reapplied in an adolescent sample to test its psychometric properties as recommended . The size of the adult sample was relatively small and unbalanced in terms of participants’ gender. Our analysis might have also been enhanced by using additional questionnaires that measured gratitude. Unfortunately, no other validated gratitude scales are available in Chile, which is precisely one of the identified gaps this article tried to address.
The relevance of research on gratitude is supported by recent evidence that suggests that regular experiences of positive emotions can make people more resilient and healthier, reinforcing an upward spiral of optimum performance . We believe that gratitude can be enhanced and trained to promote and reinforce this kind of upward spiral in people’s lives. Gratitude could serve as a powerful psychological buffer to enhance resilience and well-being [1, 10, 11, 44], particularly in young people facing relevant risk factors for mental health, including depression and addictions [12, 45].
The validation of the Chilean version of the GQ-6 will facilitate cross-cultural and international comparison of gratitude research outcomes, promoting a better understanding of the cultural similarities and differences in the way this concept is construed in different cultures. Additionally, providing a reliable measure for the assessment of gratitude in Chilean adolescents and adults will allow researchers, healthcare professionals, educators, and policy makers, to develop and measure the effects of interventions aimed at improving the levels of wellbeing and life quality in a country with one of the highest levels of mental health problems in the OECD .
The Chilean adaptations of the GQ (GQ-5 and GQ-6) showed good psychometric properties, similar to those of the original version and the previous validations in other countries and cultural contexts. Therefore, the GQ is a suitable measure to evaluate a person’s disposition toward gratitude in Chilean adolescents, young adults  and adults. This instrument may contribute to the study of positive emotions and human development in Latin America.
We would like to thank the reviewers’ comments which undoubtedly contributed to the improvement of this article.
Part of this research was supported by the Chilean National Fund for Scientific and Technological Development, Project N° 8213005 and the Fund for Innovation and Competitiveness (FIC) of the Chilean Ministry of Economy, Development and Tourism, through the Millennium Scientific Initiative, Grant N° IS130005.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
- McCullough M, Emmons R, Tsang J. The grateful disposition: A conceptual and empirical topography. J Pers Soc Psychol. 2002;82:112–27.View ArticlePubMedGoogle Scholar
- Lambert N, Fincham F, Stillman T. Gratitude and depressive symptoms: The role of positive reframing and positive emotion. Cogn Emot. 2012;26:615–33.View ArticlePubMedGoogle Scholar
- Wood A, Maltby J, Gillett R, Lileyc P, Joseph S. The role of gratitude in the development of social support, stress, and depression: Two longitudinal studies. J Res Pers. 2008;42:854–71.View ArticleGoogle Scholar
- Alarcón R, Morales C. Relaciones entre gratitud y variables de personalidad [Relationship between gratitude and personality variables]. Acta Investig Psicol. 2012;2:699–712.Google Scholar
- Froh J, Bono G, Emmons R. Being grateful is beyond good manners: Gratitude and motivation to contribute to society among early adolescents. Motiv Emot. 2010;34:144–57.View ArticleGoogle Scholar
- Bartlett M, Condon P, Cruz J, Baumann J, Desteno D. Gratitude: Prompting behaviours that build relationships. Cogn Emot. 2012;26:2–13.View ArticlePubMedGoogle Scholar
- Bartlett M, Desteno D. Gratitude and prosocial behavior. Helping when it costs you. Psychol Sci. 2006;17:319–25.View ArticlePubMedGoogle Scholar
- Tsang J. Gratitude and prosocial behaviour: An experimental test of gratitude. Cogn Emot. 2006;20:138–48.View ArticleGoogle Scholar
- Chen L, Chen M, Kee Y, Tsai Y. (2009). Validation of the Gratitude Questionnaire (GQ) in Taiwanese undergraduate students. J Happiness Stud. 2009;10:655–64.View ArticleGoogle Scholar
- Froh J, Kashdan T, Ozimkowski K, Miller N. Who benefits the most from a gratitude intervention in children and adolescents? Examining positive affect as a moderator. J Posit Psychol. 2009;4:408–22.View ArticleGoogle Scholar
- Toussaint L, Friedman P. Forgiveness, gratitude, and well-being: The mediating role of affect and beliefs. J Happiness Stud. 2009;10:635–54.View ArticleGoogle Scholar
- Wood A, Joseph S, Maltby J. Gratitude uniquely predicts satisfaction with life: Incremental validity above the domains and facets of the five factor model. Pers Individ Dif. 2008;45:49–54.View ArticleGoogle Scholar
- Eichen DM, Conner BT, Daly BP, Fauber RL. Weight perception, substance use, and disordered eating behaviors: comparing normal weight and overweight high-school students. J Youth Adolesc. 2012;41:1–13.View ArticlePubMedGoogle Scholar
- Jasik CB. Body image and health: eating disorders and obesity. Prim Care. 2014;41:519–37.View ArticlePubMedGoogle Scholar
- Watkins PC, Woodward K, Stone T, Kolts RL. Gratitude and happiness: Development of a measure of gratitude and relationships with subjective well-being. Soc Behav Pers. 2003;31:431–52.View ArticleGoogle Scholar
- Thomas M, Watkins P. Measuring the grateful trait: Development of revised GRAT. Vancouver, British Columbia, Canada: In Annual Convention of the Western Psychological Association; 2003.Google Scholar
- Bernabé-Valero G, García-Alandete J, Gallego-Pérez J. Construcción de un cuestionario para la evaluación de la gratitud: el Cuestionario de Gratitud–20 ítems (G-20) [Construction of a questionnaire for the assessmeent of gratitude: the 20 items Gratitude Questionnaire. An Psicol. 2014;30:278–86.Google Scholar
- McCullough M, Tsang J, Emmons R. Gratitude in intermediate affective terrain: Links of grateful moods to individual differences and daily emotional experience. J Pers Soc Psychol. 2004;86(2):295–309.View ArticlePubMedGoogle Scholar
- Yüksel A, Oğuz D. Turkish adaptation of the gratitude questionnaire. Egit Arast. 2012;46:199–216.Google Scholar
- Froh J, Fan J, Emmons R, Bono G, Huebner E, Watkins P. Measuring gratitude in youth: Assessing the psychometric properties of adult gratitude scales in children and adolescents. Psychol Assess. 2011;23:311–24.View ArticlePubMedGoogle Scholar
- Manso J. http://www.psicologiacientifica.com/fiabilidad-estructura-factorial-cuestionario-gratitud-cg6-estudiantes. Accessed 24 Dec 2014.
- Beck AT, Ward CH, Mendelson M, Mock J, Erbaugh J. An inventory for measuring depression. Arch Gen Psychiatry. 1961;4:561–71.View ArticlePubMedGoogle Scholar
- Garner DM, Olmsted MP, Bohr Y, Garfinkel P. The eating attitudes test: psychometric features and clinical correlates. Psychol Med. 1982;12:871–8.View ArticlePubMedGoogle Scholar
- Behar R. Trastornos del hábito del comer en adolescentes. Aspectos clínicos y epidemiológicos [Eating disorders in adolescents. Clinic and empidemiological aspects]. Rev Med Chil. 1998;126:1085–92.PubMedGoogle Scholar
- Muñiz J, Hambleton RK. Directrices para la traducción y adaptación de los tests [Guidelines for translating and adapting tests]. Pap Psicól. 1996;66:63–70.Google Scholar
- Jans-Beken LGPJ, Lataster J, Leontjevas R, Jacobs N. Measuring gratitude: a comparative validation of the dutch GQ6 and SGRAT. Psychol Belg. 2015;55:19–31.View ArticleGoogle Scholar
- Hogarty KY, Hines CV, Kromrey JD, Ferron JM, Munford KR. The quality of factor solutions in exploratory factor analysis: The influence of sample size, communality, and over determination. Educ Psychol Meas. 2005;65:202–26.View ArticleGoogle Scholar
- Lloret-Segura S, Ferreres-Traver A, Hernández-Baeza A, Tomás-Marco I. Exploratory item factor analysis: a practical guide revised and updated. An Psicol. 2014;30:1151–69.Google Scholar
- MacCallum RC, Widaman KF, Preacher K, Hong S. Sample size in factor analysis: The role of model error. Multivariate Behav Res. 2001;36:611–37.View ArticlePubMedGoogle Scholar
- Jöreskog K, Sörbom D. LISREL 8: Structural equation modelling with the SIMPLIS command language. Chicago, IL: Scientific Software International Inc.; 1993.Google Scholar
- Brooke PP, Russell DW, Price JL. Discriminant validation of measures of job satisfaction, job involvement, and organizational commitment. J Appl Psychol. 1988;73:139–46.View ArticleGoogle Scholar
- Byrne MB. Structural equation modelling with Amos: Basic concepts, applications, and programming. Mahwah, NJ: Erlbaum; 2001.Google Scholar
- George D, Mallery P. SPSS for Windows step by step: A simple guide and reference. 4th ed. Boston, MA: Allyn & Bacon; 2003.Google Scholar
- Watson D, Clark LA, Tellegen A. Development and validation of brief measures of positive and negative affect: The PANAS scales. J Pers Soc Psychol. 1988;54:1063–70.View ArticlePubMedGoogle Scholar
- Sandín B, Chorot R, Lostao L, Joiner TE, Santed MA, Valiente RM. Escalas PANAS de afecto positivo y negativo: Validación factorial y convergencia transcultural [PANAS scale of positive and negative affect: Transcultural factorial and convergent validation]. Psicothema. 1999;11:37–51.Google Scholar
- De la Rubia J. La escala de afecto positivo y negativo (PANAS) en parejas casadas mexicanas [Positive and negative affect scale (PANAS) in mexican married couples]. Cienc Ergo Sum. 2011;18(2):117–25.Google Scholar
- Lovibond P, Lovibond S. The structure of negative emotional states: comparison of the depression anxiety stress scales (DASS) with the Beck depression and anxiety inventories. Behav Res Ther. 1995;33:335–43.View ArticlePubMedGoogle Scholar
- Antúnez Z, Vinet EV. Escalas de depresión, ansiedad y estrés (DASS - 21): Validación de la versión abreviada en estudiantes universitarios chilenos [Depresion, Anxiety and Stress Scale (DASS-21): Validation of the short version in Chilean university students]. Ter Psicol. 2012;30:49–55.View ArticleGoogle Scholar
- Lyubomirsky S, Lepper H. A measure of subjective happiness: Preliminary reliability and construct validation. Soc Indic Res. 1999;46:137–55.View ArticleGoogle Scholar
- Vera-Villarroel P, Celis-Atenas K, Córdova-Rubio N. Evaluación de la felicidad: Análisis psicométrico de la escala de felicidad subjetiva en población Chilena [Hapiness Assessement: Psychometric analysis of the subjective happiness scale in Chilean population]. Ter Psicol. 2011;29:127–33.View ArticleGoogle Scholar
- Froh J, Emmons R, Card N, Bono G, Wilson J. Gratitude and the reduced cost of materialism in adolescents. J Happiness Stud. 2010;12:289–302.View ArticleGoogle Scholar
- Batista-Foguet JM, Coenders G, Alonso J. Análisis factorial confirmatorio. Su utilidad en la validación de cuestionarios relacionados con la salud [Confirmatory factorial analysis. Its utility in validation of health related questionnaires]. Med Clin. 2004;122:21–7.View ArticleGoogle Scholar
- Fredrickson B. Role of positive emotion in positive psychology. The broaden-and-build theory of positive emotions. Am Psychol. 2001;56:218–26.View ArticlePubMedPubMed CentralGoogle Scholar
- Lin CC, Yeh YC. How gratitude influences well-being: A structural equation modeling approach. Soc Indic Res. 2014;118:205–17.View ArticleGoogle Scholar
- Lambert N, Graham S, Fincham F. Prototype analysis of gratitude: Varieties of gratitude experiences. Pers Soc Psychol Bull. 2011;35:1193–207.View ArticleGoogle Scholar
- OECD. Making mental health count: the social and economic costs of neglecting mental health care. Paris: OECD Publishing; 2014.View ArticleGoogle Scholar