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Updated: Jan 28, 2026
Oral Health Assessment by Lay Personnel for Older Adults
Published on: February 2, 2020
[Psychometric characteristics of the Patient Health Questionnaire (PHQ-9)]
Sandra Saldivia1, Joseph Aslan2, Félix Cova2
1Departamento de Psiquiatría y Salud Mental, Facultad de Medicina, Universidad de Concepción, Concepción, 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 1,738 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 ω 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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