Psychometric properties of a questionnaire to measure adherence to treatment in patients with type 1 diabetes mellitus
Carmen Grau‐Del Valle,
José Francisco Marco‐Expósito,
Eva Solá,
Inmaculada Montoya‐Castilla,
Carlos Morillas,
Antonio Hernández‐Mijares,
Celia Bañuls
Affiliations
Carmen Grau‐Del Valle
Department of Endocrinology and Nutrition University Hospital Doctor Peset‐ Foundation for the Promotion of Health and Biomedical Research in the Valencian Region (FISABIO) Valencia Spain
José Francisco Marco‐Expósito
Department of Endocrinology and Nutrition University Hospital Doctor Peset‐ Foundation for the Promotion of Health and Biomedical Research in the Valencian Region (FISABIO) Valencia Spain
Eva Solá
Department of Endocrinology and Nutrition University Hospital Doctor Peset‐ Foundation for the Promotion of Health and Biomedical Research in the Valencian Region (FISABIO) Valencia Spain
Inmaculada Montoya‐Castilla
Department of Personality, Assessment and Psychological Treatment University of Valencia Valencia Spain
Carlos Morillas
Department of Endocrinology and Nutrition University Hospital Doctor Peset‐ Foundation for the Promotion of Health and Biomedical Research in the Valencian Region (FISABIO) Valencia Spain
Antonio Hernández‐Mijares
Department of Endocrinology and Nutrition University Hospital Doctor Peset‐ Foundation for the Promotion of Health and Biomedical Research in the Valencian Region (FISABIO) Valencia Spain
Celia Bañuls
Department of Endocrinology and Nutrition University Hospital Doctor Peset‐ Foundation for the Promotion of Health and Biomedical Research in the Valencian Region (FISABIO) Valencia Spain
Abstract Aim To validate the psychometric properties of a questionnaire to measure adherence to treatment among people with type 1 diabetes mellitus and to evaluate its relationship with metabolic control. Design A cross‐sectional study of 167 adult people with type 1 diabetes mellitus recruited from the Endocrinology Service of University Hospital Doctor Peset (Spain). Methods The validity of the content, construct and reliability of the instrument were evaluated and the results correlated with levels of glycosylated haemoglobin. Results The questionnaire was composed of 25 items and 5 dimensions, with a score of 25–150 points and an internal consistency of 0.92, according to Cronbach's coefficient α. The content of validity ratio and the construct (exploratory functional analysis, Kaiser–Meyer–Olkin index and Barlett's spherical test) were adequate. We observed a significant correlation between glycosylated haemoglobin levels and treatment adherence. Conclusion The questionnaire to measure adherence to treatment in type 1 diabetes mellitus is consistent, reliable and valid, showing an excellent association with degree of metabolic control.
