Invited Commentary: Improving Instruments to Counter the Bias in Their Construction.

In this issue of the Journal, Villalonga-Olives et al. (Am J Epidemiol. 2023;192(8):1264-1273) examined the psychometric properties of social capital indicators, comparing responses from Black and White people to identify whether there was differential item functioning (DIF) in social capital by race, and also when stratified by educational attainment, as a measure of socioeconomic status. The authors tested whether there is DIF in social capital items between Black and White people and found that DIF across these items was significant although not large, but they were still indicative of measurement error, which they suspected was related to the way these items were developed-that is, based on cultural assumptions tested in mainstream White America. However, some gaps remain to be fleshed out.

Symptomatology of attention deficit, hyperactivity and defiant behavior as predictors of academic achievement.

BACKGROUND: It is essential to understand the factors that affect the academic achievement of schoolchildren, both in general and in terms of the major subsectors of each grade. Although symptoms of Attention Deficit Hyperactivity Disorder (ADHD) and Negative Defiant Disorder (NDD-which are commonly recognized as externalizing problems in childhood and adolescence-have been associated with lower academic achievement in the international literature, few studies have addressed this problem in Latin America. This study aimed to analyze the possible predictive relationship of attention problems, hyperactivity, and defiant behavior on academic achievement. METHODS: We recruited a sample of 4580 schoolchildren (50.9% female, 1754 belonging to primary school, and 2826 to secondary school, ranging from 9 to 18 years old). This cross-sectional study used the scales pertaining to attention problems, hyperactivity, and challenging behavior from the Child and Adolescent Evaluation System. RESULTS: The analysis showed that attention problems significantly affected all academic achievement areas, while hyperactivity and challenging behavior affected only some of them. The regression models explained 24% of the variability in overall academic achievement in primary school and 17% in secondary school. Other predictors included sex, age, socioeconomic level, and school attendance. CONCLUSIONS: It is important to consider this symptomatology in the design of educational interventions.

Relationships between social stigma, stigma experience and self-stigma and impaired quality of life in schizophrenia across three Latin-American countries.

The relationships between stigma and quality of life in schizophrenia (QoL) have been extensively explored but have mostly focused on self-stigma and self-esteem and have never been explored in Latin-America. The objective of this study was to determine which stigma dimensions were associated with QoL in a sample of community-dwelling SZ subjects of three Latin-American countries. Stabilized outpatients with SZ were recruited in three Mental Health Services in three Latin-American countries: Bolivia (N = 83), Chile (N = 85) and Peru (N = 85). Stigma and Qol-SZ were evaluated by self-administered questionnaires, the Internalized Stigma of Mental Illness scale (ISMI-12) and the SQoL-18. 253 participants were included. In multivariate analyses, QoL has been associated with each stigma dimension (social stigma, stigma experience and self-stigma), independently of age, gender, education level, ethnicity, age at illness onset, illness symptomatology and mental health treatment. More specifically, social stigma was significantly associated with impaired psychological and physical well-being, self-esteem and friendship. Self-stigma was significantly associated with impaired psychological well-being, self-esteem and autonomy. The present results confirm the importance of stigma in QoL of SZ subjects and identify new targets to develop stigma-orientated programs. Most of the previous programs have focused on self-stigma while social stigma has shown to be associated with a wide range of impaired QoL areas. Stigma and QoL may have a bidirectional relationship and targeting some specific QoL areas (like autonomy through self-empowerment approaches) may also improve the effectiveness of these programs to reduce stigma impact on the quality of life of subjects with schizophrenia. Future studies should also explore differences across countries as subjects from Bolivia were more frequently Aymara and reported higher stigma and lower QoL than SZ subjects from other countries.

Psychiatric disorders in children and adolescents in a middle-income Latin American country.

BACKGROUND: Child and adolescent mental health has scarcely been studied in developing countries, though it is an important aspect of health. Mental health problems in youth often continue into adulthood if not diagnosed or treated in time. METHODS: The Sistema de Evaluación de Niños y Adolescentes (SENA) [Child and Adolescent Evaluation System] was used to evaluate mental health indicators in a sample of students in Northern Chile. Two age-appropriate versions of the assessment were applied to a total sample of 5043 students, which included an elementary education sample of 1953 schoolchildren from fourth grade through sixth grade (ages 8 to 13 years), and a Secondary School sample of 3090 schoolchildren from seventh grade (the last year of elementary school) through the last year of Secondary school (senior high school) (ages 12 to 19 years). For each group, the version of the assessment used was determined by the students' grade level. Both samples included municipal, government-subsidized, and private schools. RESULTS: In this student population, depression, anxiety, and behavioral disorders were the main mental health problems identified, and indicators revealed a progressive increase in cases over the years, coinciding with the global epidemiological scenario. Males showed a greater presence of externalizing behaviors related to mental health problems associated with aggression and defiant behavior. However, females showed the highest number of mental health issues overall, especially regarding problems related to internalization. There are significant differences between school types. CONCLUSIONS: Our sample population analysis indicates that early intervention is necessary for the diagnosis and treatment of youth, with the goal of reducing the probability that psychiatric disorders will be prolonged, evolving, and worsening in adulthood.

[Prevalence of anxious and depressive symptoms in Colombian migrants in Chile]. / Prevalencia de sintomatología ansiosa y depresiva en migrantes colombianos en Chile.

BACKGROUND: Migratory processes may affect mental health. Data on the health status of migrants are necessary for an adequate public health approach. AIM: To describe the prevalence of anxious and depressive symptoms in Colombian migrants living in Chile and to compare it with the Chilean population. MATERIAL AND METHODS: Beck and BDI scales for depression and BAI anxiety scale were applied to 1,932 participants living in Arica, Antofagasta and Santiago. Of these, 976 participants (51% women) aged 35 ± 10 years were first generation Colombian migrants and 956 participants aged 34 ± 14 years were Chilean. RESULTS: The scores for depressive and anxious symptoms were higher in Chileans than in Colombians. Women reported worse mental health in both groups. Chilean and Colombian respondents residing in Arica and Antofagasta had a higher degree of anxiety and depression than their counterparts residing in Santiago. CONCLUSIONS: Chileans have worse mental health indicators than Colombian migrants. There are differences by sex and city of residence.

[Mental health problems among health care workers during the COVID-19 pandemic]. / Salud mental en trabajadores de la salud durante la pandemia por COVID-19 en Chile.

BACKGROUND: COVID-19 has effects on the mental health of health care workers. AIM: To explore the presence of symptoms associated with mental health problems and associated risk factors in health workers. MATERIAL AND METHODS: The questionnaires PHQ-9 for depression, GAD-7 for anxiety, ISI-7 for insomnia and IES-R-22 for psychological distress were applied to 125 health care workers aged 18 to 67 years (32 physicians, 22 nurses and 71 of other professions) laboring in hospitals and primary care facilities along Chile. RESULTS: Sixty five percent reported depression symptoms, 74% anxiety, 65% insomnia and 57% distress. Physicians had lower median scores in all scales than nurses and other health professionals. Professionals attending patients with respiratory infections or with COVID-19 had higher median scores in the scales that their counterparts. CONCLUSIONS: The frequency of mental health problems among these professionals is high and preventive measures should be taken.

The Latin American version of the internalized stigma of mental illness scale (LA-ISMI): a multicentric validation study from three Latin American countries.

BACKGROUND: To date, no data have been available concerning the psychometric characteristics of the Internalized Stigma of Mental Illness scale (ISMI-29) in Latin American countries. The aim of this study was to validate a Latin American version of the ISMI in people with schizophrenia. METHODS: The study included 253 stabilized outpatients with schizophrenia from 3 Mental Health Services in three Latin American countries: Bolivia (N = 83), Chile (N = 85) and Peru (N = 85). We analyzed the psychometric properties using item response and classical test theories. An item reduction was then performed to improve the psychometric properties of the ISMI-29. The final version of the ISMI was tested for construct validity, reliability, external validity and differential item functioning (DIF). RESULTS: The five-factor structure of the ISMI-29 was not confirmed using confirmatory factor analysis (RMSEA = 0.12, CFI = 0.77, and WRMR = 2.20). Seventeen items were discarded to obtain a satisfactory psychometric version. The ISMI-12 evaluates 3 dimensions: social stigma (4 items), stigma experience (4), and self-stigma (3). The factor structure accounted for 68% of the total variance. Internal consistency was satisfactory. The scalability was satisfactory, with INFIT statistics within an acceptable range. In addition, the results confirmed the absence of DIF and supported the invariance of the item calibrations between countries. CONCLUSION: The ISMI-29 is not valid in our sample and should not be used in Latin American countries. The ISMI-12 is the first internalized stigma questionnaire with satisfactory psychometric properties available in Latin American countries. Its brevity could facilitate its dissemination and use in clinical settings.

Predictors of unmet needs in Chilean older people with dementia: a cross-sectional study.

BACKGROUND: The needs of people with dementia (PWD) have not been assessed in any Latin American country. Several European countries have already related unmet needs with quality of life, caregiver's age, burden, stress, anxiety and depression. The aim of this study was to identify met and unmet needs in Chilean older adults with dementia and to determine if those needs were associated with PWD's, their informal caregivers' and social factors. METHOD: This was a cross-sectional study. One-hundred and sixty-six informal caregivers and their care recipients were interviewed. PWD was assessed about cognitive function and their caregivers answered instruments about PWD's needs, functional status and behavioral and psychological symptoms. Caregiver's burden, depression, anxiety and social support were also evaluated. A stepwise multiple linear regression analysis was performed to determine predictors of unmet needs in Chilean PWD. RESULTS: The most frequent met needs were "Looking after home" (81.3%%), "Food" (78.9%) and "Selfcare" (75.3%). Most common unmet needs were "Daily living activities" (39.2%), "Company" (36.1%), and "Memory" (34.9%). Caregivers' lower age was correlated to a higher number of PWD's unmet needs (rs = -.216; p < 0.005). Higher PWD's dependence was associated with higher number of unmet needs (rs = .177; p < 0.05). The best predictors of unmet needs were caregivers' low level of social support, high burden, young age and high level of anxiety. CONCLUSION: It is necessary to address psychological and social needs of PWD. The fact that PWD's unmet needs were associated mostly with caregivers' factors, highlights the importance of considering both, the PWD and their informal caregivers as targets of institutional support. It is expected that recently launched national public policies decrease PWD's unmet needs by the provision of new services for them and their informal caregivers.

Self-stigma in patients with schizophrenia: a multicentric study from three Latin-America countries.

The aim of this study was to describe the degree of self-stigma in patients with schizophrenia across three Latin-Americans countries (Bolivia, Chile and Peru). The study included 253 outpatients that were assessed using the Internalized Stigma of Mental Illness Scale (ISMI). The results show that 48.7% of patients from Bolivia report high internalized stigma compared to 38.6% from Chile and 28.6% from Peru. There were no statistically significant differences in ISMI mean total scores for country (p = 0.057), however, there were significant differences on two subscales: alienation and social withdrawal for which Bolivia had the highest scores. In conclusion, even though these countries share several common cultural characteristics, there are also some differences between them on patients' self-stigma.

Differences on Quality of Life of Patients with Schizophrenia: A Multicentric Study from Three Latin-America Countries.

The aim of the study is to explore the variation on patient's Quality of Life (QoL) across three Latin-Americans countries. The study included 253 stabilized outpatients with schizophrenia from three Mental Health Services in Bolivia (N = 83), Chile (N = 85) and Peru (N = 85). Patients' were assessed using Schizophrenia Quality of Life Questionnaire (SQoL18). We collected socio-demographic information and clinical data, while recognizing the cultural complexity/dynamics of each country, and the influence of cultural contexts on how people experience the health systems. There are differences in QoL according to each country. Peru reports better levels of QoL at the Total Score Index and in most of the dimensions of the SQoL18. Bolivia shows the lowest indicators of QoL, except, interestingly, for the Resilience dimension where it reaches the highest scores. Even when the studied regions in the three Latin American countries share several cultural characteristics, there are also some important differences between them on patients' QoL. Possible disparities at investment in mental health by the Governments of each country are discussed while possible influences of (inter)cultural contexts are taken into account.

Schizophrenia: Impact on Family Dynamics.

In many societies, family members are now the primary caregivers of mental health patients, taking on responsibilities traditionally under the purview of hospitals and medical professionals. The impact of this shift on the family is high, having both an emotional and economic toll. The aim of this paper is to review the main changes that occur in family dynamics for patients with schizophrenia. The article addresses three central themes: (i) changes in the family at the onset of the disorder, (ii) consequences for family members because of their caregiver role, and (iii) family interventions aimed at improving the complex dynamics within the family. After analyzing and discussing these themes, it is observed that despite advances in the field, the viability of taking care of a patient with schizophrenia by the family remains a challenge. Improving care will require commitments from the family, the mental health service system, and local and national governments for greater investments to improve the quality of life of society in general and individuals with schizophrenia in particular.

Caregiver's quality of life and its positive impact on symptomatology and quality of life of patients with schizophrenia.

BACKGROUND: Although the quality of life (QoL) experienced by patients with schizophrenia has been recognized, few studies have assessed the relationship between the caregivers' QoL and patients' QoL. METHODS: The study included 253 stabilized outpatients with schizophrenia and their caregivers from 3 Mental Health Services in Bolivia (N = 83), Chile (N = 85) and Peru (N = 85). Caregivers' and patients' QoL were respectively assessed using two specific QoL questionnaires (S-CGQoL and S-QoL 18). We collected socio-demographic information and clinical data. Multiple linear regressions were performed to determine which variables were associated with patient's QoL. We tested the following hypothesis using structural equation modeling (SEM): caregivers' QoL may have an indirect effect on patients' QoL mediated by their influence of the severity of psychotic symptoms. RESULTS: In the multivariate analysis, the caregivers' QoL was not significantly associated with the patients' QoL, except for one QoL dimension about relationship with family (Beta = 0.23). Among patients' characteristics, being a woman and Aymara, having lower educational level, unemployment and severity of symptoms was significantly associated to a lower QoL. The SEM revealed a moderate significant association between caregivers' QoL and psychotic symptoms severity (path coefficient = -0.32) and a significant association between psychotic symptoms severity and patients QoL (path coefficient = -0.40). The indirect effect of caregivers' QoL on patients' QoL was significant (mediated effect coefficient = 0.13). CONCLUSION: Improvement of caregiver's QoL may have a direct impact on the psychotic symptoms of patients and indirectly on patient's QoL, confirming the need for ongoing family interventions in these regions.

Religion involvement and quality of life in patients with schizophrenia in Latin America.

OBJECTIVE: The aim of the study was to explore the relationship between religion involvement (RI) and quality of life (QoL) in patients with schizophrenia from three countries in Latin America, while considering key confounding factors such as socio-demographic and clinical characteristics. METHODS: This cross-sectional study was conducted in the public mental health services in La Paz, Bolivia; Arica, Chile; and Tacna, Peru. The data collected included RI, socio-demographic information, clinical characteristics, type of treatment and QoL using the S-QoL 18 questionnaire. A multivariate analysis using multiple linear regressions was performed to determine variables associated with QoL levels. RESULTS: Two hundred and fifty-three patients with schizophrenia were enrolled in our study. Significant positive associations were found between RI and QoL (the S-QoL 18 index: ß = 0.13; p = 0.048; autonomy dimension: ß = 0.15; p = 0.027). Other socio-cultural and economic factors were also associated with low QoL level: being a woman, older patient, low education level and being Aymara. Severity of the psychotic symptoms was associated to a lower QoL for all the dimension (ß from 0.15 to 0.31), except for the resilience. CONCLUSION: Our study found that socio-cultural and economic factors including RI were associated with QoL in patients with schizophrenia in Latin America, suggesting that these factors may influence positively health outcome. However, these relationships were moderate in strength, especially in comparison to symptoms severity which remained the most important features associated with QoL.

[Mental health and stress by acculturation in immigrants from South America in northern Chile]. / Salud mental y estrés por aculturación en inmigrantes sudamericanos en el norte de Chile.

BACKGROUND: Coping with changes brought about by immigration and social circumstances that often characterize this process may cause mental health problems. AIM: To analyze the relationship between acculturation stress and mental health symptoms in South American immigrants residing in Antofagasta, Chile. MATERIAL AND METHODS: The OQ questionnaire, which assesses mental health and the acculturation stress questionnaire from Ruiz, were answered by 431 immigrants (53.8% Colombian and 46.2% Peruvian) aged between 18 and 65 years old. RESULTS: The major source of acculturation stress was distance from origin, followed by difficulties in social relationships and perceived discrimination and rejection. About 50% of respondents had elevated levels of discomfort in their life, with mental health problems derived from their adjustment to social roles and relationships. There was a high correlation between acculturation stress levels and severity of mental health symptoms. CONCLUSIONS: Immigrants are exposed to high levels of stress resulting in a negative impact on their mental health.

Subjective perceptions of cognitive deficits and their influences on quality of life among patients with schizophrenia.

PURPOSE: Functional outcomes in schizophrenia may be more closely related to social cognition than to neurocognition; however, the extent to which social cognition influences quality of life (QoL) remains unclear. We conducted a cross-sectional survey study of the impact of patients' and clinicians' subjective perceptions of neurocognitive and social cognitive deficits on quality of life. METHODS: The study included 253 patients with schizophrenia and their clinicians from public mental health clinics in Bolivia, Chile, and Peru. We utilized the GEOPTE Scale of Social Cognition for Psychosis, the Schizophrenia Quality of Life Questionnaire, and the Positive and Negative Syndrome Scale for schizophrenia. RESULTS: Patients' subjective perceptions of their neurocognitive deficits (B = -1.13; CI -1.56 to -0.70) were significantly associated with QoL, whereas there was no independent association between the clinicians' ratings of the patients' neurocognitive deficits and QoL (B = -0.33; CI -0.98 to 0.31). However, patients' subjective perceptions of their neurocognitive deficits were no longer associated with QoL (B = -0.23; CI -0.71 to 0.24) once their perceptions of social cognitive impairments were accounted for (B = -1.03; CI -1.39 to -0.68). CONCLUSION: Patients' perceptions of their social cognitive function (but not neurocognitive functioning) have a significant impact on their QoL. Clinicians' ratings of patients' cognitive deficits were only weakly correlated with patients' subjective perceptions of their own neurocognitive, suggesting a mismatch between clinician and patient assessments of such deficits. Closer attention should therefore be paid toward patients' perception of their own deficits by clinicians in order to improve QoL.

[Psychometric properties of the diabetes mellitus 2 treatment adherence scale version III (EATDM-III) adapted for Chilean patients]. / Análisis preliminares de la versión adaptada en población chilena de la escala de adherencia terapéutica en diabetes mellitus tipo 2--EATDM-III.

BACKGROUND: The Diabetes Mellitus 2 treatment adherence scale version III (EATDM-III) was devised in Costa Rica. Its seven factors are family support, community organization and support, physical exercise, medical control, hygiene and self-care and assessment of physical condition. AIM: To assess the psychometric properties of the scale in Chilean patients. MATERIAL AND METHODS: The results of the EATDM-III scale, applied to 274 patients with Diabetes Mellitus 2 aged 59 ± 11 years (59% women), were analyzed. Reliability, item, exploratory and confirmatory factorial analyses were carried out both in the initial and the proposed model. RESULTS: We propose a version of 30 items grouped in six dimensions, improving the fit indices obtained with the original scale. The review of item factor loadings shows that all are appropriate both in magnitude and statistical significance, with values between 0.46 and 0.93. Internal consistency measured by Cronbach's alpha, was 0.85 for the total scale. CONCLUSIONS: The adapted EATDM-III scale is reliable and can be used to assess treatment adherence in Chilean patients.

Mental health of indigenous school children in Northern Chile.

BACKGROUND: Anxiety and depressive disorders occur in all stages of life and are the most common childhood disorders. However, only recently has attention been paid to mental health problems in indigenous children and studies of anxiety and depressive disorders in these children are still scarce. This study compares the prevalence of anxiety and depressive symptoms in Aymara and non-Aymara children. Among the Aymara children, the study examines the relations between these symptoms and the degree of involvement with Aymara culture. METHODS: We recruited 748 children aged 9 to 15 years from nine schools serving low socioeconomic classes in the city of Arica, in northern Chile. The children were equally divided between boys and girls and 37% of the children were Aymara. To evaluate anxiety and depressive symptoms we used the Stress in Children (SiC) instrument and the Children Depression Inventory-Short version (CDI-S), and used an instrument we developed to assess level of involvement in the Aymara culture. RESULTS: There was no significant difference between Aymara and non-Aymara children on any of the instrument scales. Dividing the Aymara children into high-involvement (n = 89) and low-involvement (n = 186) groups, the low-involvement group had significantly higher scores on the Hopelessness subscale of the CDI-S (p = 0.02) and scores of marginally higher significance in overall Anxiety on the SiC (p = 0.06). CONCLUSIONS: Although Aymara children have migrated from the high Andean plateau to the city, this migration has not resulted in a greater presence of anxiety and depressive symptoms. Greater involvement with the Aymara culture may be a protective factor against anxiety and depressive symptoms in Aymara children. This point to an additional benefit of maintaining cultural traditions within this population.

The 5Cs of positive youth development: their impact on symptoms of depression, anxiety, stress, and emotional distress in Chilean adolescents.

Effective approaches to addressing mental health challenges faced by adolescents require a deep understanding of the factors contributing to optimal development, well-being, and prosperity. From the perspective of Positive Youth Development (PYD), this study proposes to examine the relationship between the 5Cs of PYD (Competence, Confidence, Connection, Character, and Caring) and symptoms of depression, anxiety, stress, and emotional distress among Chilean adolescents. A quantitative, cross-sectional, non-experimental study was conducted with 425 adolescents (ages 12 to 19, M = 14.95, SD = 1.81) from three Chilean cities: Arica (23%), Alto Hospicio (32%), and Iquique (46%). Data analysis included the use of confirmatory factor analysis (CFA) and structural equation modeling (SEM). The results indicate that two of the 5Cs, Confidence and Connection, have a significant negative direct effect on the four evaluated criterion indicators. These findings contribute to the literature on positive youth development in Latin America and underscore the importance of fostering confidence and connection in interventions aimed at promoting the mental health of adolescents in Chile and in similar contexts.

Psychometric Assessment of an Item Bank for Adaptive Testing on Patient-Reported Experience of Care Environment for Severe Mental Illness: Validation Study.

BACKGROUND: The care environment significantly influences the experiences of patients with severe mental illness and the quality of their care. While a welcoming and stimulating environment enhances patient satisfaction and health outcomes, psychiatric facilities often prioritize staff workflow over patient needs. Addressing these challenges is crucial to improving patient experiences and outcomes in mental health care. OBJECTIVE: This study is part of the Patient-Reported Experience Measure for Improving Quality of Care in Mental Health (PREMIUM) project and aims to establish an item bank (PREMIUM-CE) and to develop computerized adaptive tests (CATs) to measure the experience of the care environment of adult patients with schizophrenia, bipolar disorder, or major depressive disorder. METHODS: We performed psychometric analyses including assessments of item response theory (IRT) model assumptions, IRT model fit, differential item functioning (DIF), item bank validity, and CAT simulations. RESULTS: In this multicenter cross-sectional study, 498 patients were recruited from outpatient and inpatient settings. The final PREMIUM-CE 13-item bank was sufficiently unidimensional (root mean square error of approximation=0.082, 95% CI 0.067-0.097; comparative fit index=0.974; Tucker-Lewis index=0.968) and showed an adequate fit to the IRT model (infit mean square statistic ranging between 0.7 and 1.0). DIF analysis revealed no item biases according to gender, health care settings, diagnosis, or mode of study participation. PREMIUM-CE scores correlated strongly with satisfaction measures (r=0.69-0.78; P<.001) and weakly with quality-of-life measures (r=0.11-0.21; P<.001). CAT simulations showed a strong correlation (r=0.98) between CAT scores and those of the full item bank, and around 79.5% (396/498) of the participants obtained a reliable score with the administration of an average of 7 items. CONCLUSIONS: The PREMIUM-CE item bank and its CAT version have shown excellent psychometric properties, making them reliable measures for evaluating the patient experience of the care environment among adults with severe mental illness in both outpatient and inpatient settings. These measures are a valuable addition to the existing landscape of patient experience assessment, capturing what truly matters to patients and enhancing the understanding of their care experiences. TRIAL REGISTRATION: ClinicalTrials.gov NCT02491866; https://clinicaltrials.gov/study/NCT02491866.

[Factorial structure of WHOQoL-Bref quality of life questionnaire]. / Estructura Factorial y valores de referencia del WHOQoL-Bref en población adulta chilena.

BACKGROUND: The real value of quality of life instruments must be tested in local populations before recommending their widespread use. AIM: To assess the factorial structure of the quality of life questionnaire proposed by the World Health Organization (WHO), WHOQoL-Bref. MATERIAL AND METHODS: The questionnaire was answered by 2016 individuals aged between 20 and 59 years, from diverse public and social organizations of a city in Northern Chile. The confidence and factorial structure of the instrument were evaluated. RESULTS: The internal consistency of the instrument, according to Cronbach's alpha was 0.89. The adjustment of values to a model with four factors proposed by the WHO was moderate. The root mean square (RMS) and root mean square error of approximation (RMSEA) values of0.043 and 0.061, indicate a good adjustment of the model. CONCLUSIONS: Although an absolute adjustment for the theoretical four factor model is not supported by these results, the WHOQoL-Bref is able to discriminate the perception of quality of life and the influence of age, gender and disease on this perception.