CONTACT-Patient-Centred Care Questionnaire to assess care for patients treated with oral anticancer drugs: Development and psychometric validation

Objective Instruments to measure quality of patient-centred care (PCC) for the rapidly growing population of patients treated with oral anticancer drugs (OACD) are lacking. The aim of this study was to develop a valid and reliable instrument to assess PCC in the context of OACD. Methods The CONTACT-Patient-Centred Care Questionnaire (CONTACT-PCCQ) was developed based on a validated set of key elements (KEs) for patient-centred education and counselling in patients taking OACD, and face validity was evaluated by means of cognitive interviews. In 16 Belgian hospitals, adult patients treated with OACD were asked to complete the questionnaire. Construct validity was investigated through exploratory factor analyses (EFAs) and internal consistency of the subscales was examined using Cronbach's alpha. Results The initial 86-item instrument was completed by 464 patients. Each EFA confirmed the a priori PCC-based structure of the subscales. However, EFA revealed more than one factor for two of the subscales. Therefore, multiple subsections within these subscales were created. Based on factor loadings and item content, six items were removed. This resulted in a final 80-item instrument with seven subscales and five subsections. Cronbach's alpha for the subscales and subsections ranged between 0.732 and 0.918, which implies adequate internal consistency. Conclusion A final instrument with 80 items divided into seven subscales, covering all six dimensions of PCC, was obtained. The CONTACT-PCCQ has acceptable psychometric properties, supporting its use as a measure to assess care experiences of patients treated with OACD.