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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Translating measurement into practice: Brazilian norms for depressive symptom assessment with the Patient Health Questionnaire (PHQ-9)

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Author(s):
Rodolfo Furlan Damiano [1] ; Maurício Scopel Hoffmann ; Natan Pereira Gosmann ; Pedro Mario Pan [4] ; Eurípedes Constantino Miguel [5] ; Giovanni Abrahão Salum
Total Authors: 6
Affiliation:
[1] Instituto de Psiquiatria, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo. Departamento de Psiquiatria - Brasil
[4] Universidade Federal de São Paulo. Departamento de Psiquiatria - Brasil
[5] Instituto de Psiquiatria, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo. Departamento de Psiquiatria - Brasil
Total Affiliations: 6
Document type: Journal article
Source: Revista Brasileira de Psiquiatria; 2023-07-03.
Abstract

Objectives: To provide practical norms for measuring depressive symptoms with the Patient Health Questionnaire 9 (PHQ-9) in Brazil through a state-of-the-art psychometrics analysis. Methods: We used a large representative dataset from the 2019 Brazilian National Health Survey (Pesquisa Nacional de Saúde – 2019), which included 90,846 Brazilian citizens. To assess scale structure, we assessed a unidimensional model using confirmatory factor analysis. Item response theory was used to characterize the distribution of depressive symptoms. Summed- and mean-based PHQ-9 scores were then linked using item response theory-based scores in generalized additive models. Finally, percentiles, T scores, and a newly developed score, called the decimal score (D score), were generated to describe PHQ-9 norms for the Brazilian population. Results: Confirmatory factor analysis revealed a good fit to the unidimensional model, being invariant to age and sex. Item response theory captured item-level information about the latent trait (reliable from 1 to 3 SDs above the mean). Brazilian norms were presented using summed scores, T scores, and D scores. Conclusion: This is the first study to determine Brazilian norms for the PHQ-9 among a large representative sample using robust psychometric tools. More precise PHQ-9 scores are now available and may be widely used in primary and specialized clinical care settings. (AU)

FAPESP's process: 21/14379-8 - Psychiatric and cognitive manifestations associated with SARS-CoV-2 virus infection
Grantee:Rodolfo Furlan Damiano
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)