Patient Health Questionnaire-9: a clinimetric analysis

Cosci, Fiammetta; Christensen, Kaj Sparle; Ceccatelli, Sara; Patierno, Chiara; Carrozzino, Danilo

Cosci, Fiammetta; Christensen, Kaj Sparle; Ceccatelli, Sara; Patierno, Chiara; Carrozzino, Danilo.

Afiliação

Cosci, Fiammetta; University of Florence. Department of Health Sciences. Florence. IT
Christensen, Kaj Sparle; Aarhus University. Department of Public Health. Research Unit for General Practice and Section for General Medical Practice. Aarhus. DK
Ceccatelli, Sara; University of Florence. Department of Experimental and Clinical Medicine. Florence. IT
Patierno, Chiara; University of Florence. Department of Health Sciences. Florence. IT
Carrozzino, Danilo; University of Bologna. Department of Psychology Renzo Canestrari. Bologna. IT

Braz. J. Psychiatry (São Paulo, 1999, Impr.) ; Braz. J. Psychiatry (São Paulo, 1999, Impr.);46: e20233449, 2024. tab

Article em En | LILACS-Express | LILACS | ID: biblio-1564069

Biblioteca responsável: BR1.1

Localização: 1516-4446-rbp-46-e20233449.xml

ABSTRACT

ABSTRACT

Objective:

The Patient Health Questionnaire-9 (PHQ-9) is a widely used self-report measure of depression whose psychometric properties were found to be merely acceptable. Insufficient attention has been devoted to its clinimetric validity, while its clinical utility is still debated, particularly for assessing depression severity. This is the first study to test the PHQ-9 construct validity and clinical utility based on clinimetric principles.

Methods:

An online survey of 3,398 participants was conducted. Item response theory models (Rasch and Mokken analyses) were used to assess the PHQ-9 validity and determine its clinical utility.

Results:

Fit to the Rasch model was achieved after adjusting the sample size. Items 2, 4, 6, and 9 over-discriminated, while items 1, 5, and 7 under-discriminated. Local dependency between items 2 and 6 was indicated. The PHQ-9 was not unidimensional. A Loevinger's coefficient of 0.49 was found, indicating an acceptable level of scalability.

Conclusion:

The PHQ-9 is an instrument with potential clinical utility as an overall index of depression, mainly for screening purposes. Substantial revision, particularly in the wording of over- and under-discriminating items, is needed.

Palavras-chave

PHQ-9; Rasch analysis; depression; patient-reported outcome measure; validity

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Texto completo: 1 Coleções: 01-internacional Base de dados: LILACS Idioma: En Revista: Braz. J. Psychiatry (São Paulo, 1999, Impr.) Assunto da revista: PSIQUIATRIA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Dinamarca / Itália País de publicação: Brasil

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