Abstract
Objectives: The Diabetes Self-Management Questionnaire (DSMQ) has been judged a better statistical predictor of glycaemic control relative to the widely used Summary of Diabetes Self-Care Activities Measure. Our aim was to assess the psychometric properties of an adapted 14-item DSMQ among Nigerians with diabetes at the University of Port Harcourt Teaching Hospital, Port Harcourt, Nigeria.
Methods: The DSMQ was administered to 119 type-2 diabetes patients, selected by stratified sampling, as part of diabetes perceived severity study. The DSMQ with its 4 subscales was tested for reliability using inter item correlation and Cronbach’s alpha; and criterion-related, concurrent validity against fasting blood sugar, the existing measure of glycaemic control. Confirmatory Factor Analysis (CFA) using Principal Component approach was conducted for factor-based construct validity.
Results: Cronbach’s alpha was 0.48 for the sum scale, 0.45 for the GU subscale, 0.07 for the DC subscale, 0.18 for the PA subscale and 0.12 for the HU subscale. The mean-item correlation was 0.75. CFA with rotation using the Oblique Oblimin extracted 4 factors that all items correlated satisfactorily with. For the GM subscale 3/5 items loaded into one component, 2/3 items of the PA subscale and 2/3 of the DC subscale. Pearson correlation between the DSMQ sum score and the current blood glucose was -0.13 (p=0.16).
Conclusion: The DSMQ-14 tool and its subscales demonstrated moderate internal consistency. Though a four-component construct was validated, it was divergent from the original subscales. Concurrent validity was also not confirmed between the DSMQ and fasting blood sugar. The DSMQ deserves further testing and adaptation for local use.
Citation
Babatunde S and Onu R. Psychometric Performance of the Diabetes Self Management Questionnaire (DSMQ) Among Individuals Attending a Referral Hospital in Port Harcourt, Nigeria. SM J Public Health Epidemiol. 2018; 4(1): 1047.