Schmitt, AndreasAndreasSchmittReimer, AndréAndréReimerHermanns, NorbertNorbertHermanns0000-0002-2903-2677Huber, JörgJörgHuberEhrmann, DominicDominicEhrmann0000-0002-5794-5596Schall, SabineSabineSchallKulzer, BernhardBernhardKulzer2019-09-192017-03-1520161932-6203https://fis.uni-bamberg.de/handle/uniba/41776Aim: To appraise the Diabetes Self-Management Questionnaire (DSMQ)’s measurement of diabetes self-management as a statistical predictor of glycaemic control relative to the widely used SDSCA. Methods: 248 patients with type 1 diabetes and 182 patients with type 2 diabetes were cross-sectionally assessed using the two self-report measures of diabetes self-management DSMQ and SDSCA; the scales were used as competing predictors of HbA1c. We developed a structural equation model of self-management as measured by the DSMQ and analysed the amount of variation explained in HbA1c; an analogue model was developed for the SDSCA. Results: The structural equation models of self-management and glycaemic control showed very good fit to the data. The DSMQ’s measurement of self-management showed associations with HbA1c of –0.53 for type 1 and –0.46 for type 2 diabetes (both P < 0.001), explaining 21% and 28% of variation in glycaemic control, respectively. The SDSCA’s measurement showed associations with HbA1c of –0.14 (P = 0.030) for type 1 and –0.31 (P = 0.003) for type 2 diabetes, explaining 2% and 10% of glycaemic variation. Predictive power for glycaemic control was significantly higher for the DSMQ (P < 0.001). Conclusions: This study supports the DSMQ as the preferred tool when analysing self-reported behavioural problems related to reduced glycaemic control. The scale may be useful for clinical assessments of patients with suboptimal diabetes outcomes or research on factors affecting associations between self-management behaviours and glycaemic control.engDiabetes melitusHbA1cType 2 diabetesBlood sugarBehaviorPatientsDietPychometrics150article10.1371/journal.pone.0150774http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0150774&type=printable