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Development of a self-efficacy questionnaire, ‘Insulin Therapy Self-efficacy Scale (ITSS)’, for insulin users in Japanese: The Self-Efficacy-Q study

Authors :
Junko Nakaue
Hitoshi Ishii
Sadanori Okada
Hiroki Nakajima
Yasuhiro Akai
Yasuaki Hayashino
Takako Mohri
Miyuki Koizumi
Yasunori Sato
Miyuki Furuya
Source :
Journal of Diabetes Investigation, Vol 10, Iss 2, Pp 358-366 (2019), Journal of Diabetes Investigation
Publication Year :
2018
Publisher :
Wiley, 2018.

Abstract

Aims/Introduction Although patient self‐efficacy is known to affect adherence to therapy, no available tool measures self‐efficacy of insulin therapy administration while addressing the entire therapeutic process and management. In light of this, we developed the ‘Insulin Therapy Self‐efficacy Scale (ITSS).’ Materials and Methods Development of the ITSS involved three phases: (i) item generation and creation of a questionnaire draft; (ii) testing and correcting the items through interviews with patients; and (iii) a multicenter, single‐arm study to validate the questionnaire. Results A factor analysis and Cronbach's α both confirmed good internal consistency in the patients’ confidence regarding the following four factors: the insulin injection procedure, insulin titration, glycemic control and ability to cope with hypoglycemia. Reproducibility was confirmed using weighted κ statistics and intraclass correlations. Good concurrent validity was confirmed with two other questionnaires. The ITSS score was also found to correlate with several patient characteristics and clinical parameters, as well as with a better adherence to injected insulin therapy 6 months later, suggesting the predictive validity of this scale. Conclusions The ITSS is a reliable and valid tool for assessing and quantifying patients’ self‐efficacy. The ITSS estimation of self‐efficacy can predict a patient's glycemic control and future adherence to insulin therapy. These characteristics will ensure the usefulness of the ITSS in ensuring a successful therapeutic process for patients and physicians.

Details

ISSN :
20401116
Volume :
10
Database :
OpenAIRE
Journal :
Journal of Diabetes Investigation
Accession number :
edsair.doi.dedup.....9838f6bfcf10675341c167fc4ca3d6f2