Translating measurement into practice with PHQ-9 calculator: an open tool to assess depression levels in the Brazilian population

do Amaral, João Villanova, Duarte, Igor, Simioni, André Rafael, Jobim, Gabriele Dos Santos, Porto, Ighor Miron, Pacheco, João Pedro Gonçalves, Damiano, Rodolfo Furlan and Hoffmann, Maurício Scopel (2025) Translating measurement into practice with PHQ-9 calculator: an open tool to assess depression levels in the Brazilian population. Trends in Psychiatry and Psychotherapy. ISSN 2237-6089 (In Press)

Text (phq9_article) - Accepted Version Pending embargo until 1 January 2100. Download (464kB)

Abstract

We aim to create a web-based calculator for assessing depressive symptoms with the Patient Health Questionnaire 9 (PHQ-9), utilizing IRT-based standardized scores, to improve measurement precision, standardization, and practical application in clinical practice. This study developed a web-based calculator using a graded response IRT model for assessing depressive symptoms with the PHQ-9, using data from the Brazilian National Health Survey 2019 (n = 90,846, aged 15 to 107 years old, 52.8% female). The tool calculates latent depressive symptoms and converts them into T-scores, with stratification by sex and age groups. The application respects patient confidentiality by deleting sensitive information postcalculation. Estimated models resulted in a mean sample size of 3244.5 participants in each group (SD: 1066). The calculator can be accessed at https://mheg.shinyapps.io/phq9-score. The development of an IRT-based web calculator for the PHQ-9 represents an advancement in depressive symptoms' assessment, offering precision and potential clinical utility. By standardizing scores into a common metric, this tool facilitates the interpretation of depressive symptoms and comparison across different instruments. The study's scope is limited to the Brazilian population and external validity for other contexts is warranted. Future studies should evaluate the clinical validity and the threshold of the tool for predicting real life problems.

Item Type:	Article
Divisions:	LSE
Subjects:	R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry B Philosophy. Psychology. Religion > BF Psychology
Date Deposited:	17 Feb 2025 12:15
Last Modified:	20 Feb 2025 09:18
URI:	http://eprints.lse.ac.uk/id/eprint/127320

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