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PSYCHOMETRIC CHARACTERISTICS OF THE PATIENT HEALTH QUESTIONNAIRE (PHQ-9)

Propiedades psicométricas del PHQ-9 (Patient Health Questionnaire) en una muestra aleatoria de adultos consultantes en centros de atención primaria de Chile

Author
Saldivia, Sandra; Universidad de Concepción

Aslan, Joseph; Universidad de Concepción

Cova, Félix; Universidad de Concepción

Vicente, Benjamín; Univerridad de Concepción

Inostroza, Carolina

Rincón, Paulina

Full text
http://www.revistamedicadechile.cl/ojs/index.php/rmedica/article/view/6759
Abstract
Background: Simple and brief questionnaires with adequate psychometric properties are useful for the early detection of depressive disorders. Aim: To analyze the psychometric behavior of the Patient Health Questionnaire (PHQ-9) in Chile. Material and methods: Data were collected from 1738 adult patients, consulting in primary health care centers. The values obtained in the PHQ-9 were compared with those of the Composite International Diagnostic Interview (CIDI). Results: The mean score of PHQ-9 was 4.85 ± 5.57. Internal consistency indices were high. McDonald´s ? coefficient of was 0.90 and Cronbach alpha 0.89. A confirmatory factor analysis showed a good fit of the one-dimensional model. Using a cutoff score of seven determined with the receiver operating characteristic (ROC) curve, the sensitivity and specificity of the instrument were 0.8 and 0.7, when compared with CIDI diagnoses. Conclusions: PHQ-9 is a useful instrument for the screening of depressive disorders in primary health care centers in Chile.
 
Background: Simple and brief questionnaires with adequate psychometric properties are useful for the early detection of depressive disorders. Aim: To analyze the psychometric behavior of the Patient Health Questionnaire (PHQ-9) in Chile. Material and methods: Data were collected from 1738 adult patients, consulting in primary health care centers. The values obtained in the PHQ-9 were compared with those of the Composite International Diagnostic Interview (CIDI). Results: The mean score of PHQ-9 was 4.85 ± 5.57. Internal consistency indices were high. McDonald´s ? coefficient of was 0.90 and Cronbach alpha 0.89. A confirmatory factor analysis showed a good fit of the one-dimensional model. Using a cutoff score of seven determined with the receiver operating characteristic (ROC) curve, the sensitivity and specificity of the instrument were 0.8 and 0.7, when compared with CIDI diagnoses. Conclusions: PHQ-9 is a useful instrument for the screening of depressive disorders in primary health care centers in Chile.
 
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