Internal Reliability and External Validation of the Research Questionnaire
The Cronbach α values for DCS score, API-DM, TEGR, and caregiver role were 0.94, 0.74, 0.76, and 0.66 respectively, suggesting good internal reliability. Also, correlations in the data set were consistent with prior research and trends expected in the real world, suggesting external validity as well (eTable 2 in 