# Validation of the Portuguese version of the diabetes self-management questionnaire-revised (DSMQ-R) in people with type 2 diabetes mellitus

## TL;DR

The study validated a Portuguese version of a questionnaire to assess diabetes self-management behaviors in people with type 2 diabetes.

## Contribution

The Portuguese version of the DSMQ-R was validated for use in people with type 2 diabetes mellitus.

## Key findings

- The Portuguese DSMQ-R showed sufficient internal consistency (alpha = 0.82).
- The questionnaire's factor structure was robust and aligned with the original version.
- Scale scores correlated with HbA1c levels, supporting its validity in assessing self-management behaviors.

## Abstract

Reflecting people with diabetes’ self-management activities is often required in both research and clinical practice. This study evaluated the measurement properties of the Portuguese version of the Diabetes Self-Management Questionnaire-Revised (DSMQ-R) on a sample of people with type 2 diabetes mellitus (T2DM).

Translation and cultural adaptation were conducted according to guidelines for cross-cultural adaptation and validation of healthcare measurement instruments. A cross-sectional study was performed including 365 people with T2DM in primary care. Reliability, construct validity, and criterion validity were analyzed.

The total scale of the translated DSMQ-R revealed sufficient internal consistency (alpha = 0.82), and most of the subscales performed adequately. The exploratory factor structure was robust, and confirmatory analysis showed a good model fit with the scale structure of the original scale. The scale scores correlated with the participants’ last HbA1c estimates, supporting convergent validity, and convergence was confirmed by the adequate average variance extracted.

The Portuguese version of the DSMQ-R is a reliable and valid tool for gauging self-management behaviors in people with T2DM and their relationship with glycemic values.