Design and validation of an instrument about quality of the advance care planning for professionals

Abstract

Objective: To develop a questionnaire aimed to measure the quality of the advance care planning process in healthcare professionals and to assess its psychometric quality. Method: Instrumental questionnaire validation study. Scope: primary care centers and outpatients clinics from general hospitals in Ferrol, Ourense, Monforte-Lugo and Health Area V of the Health Service of Asturias. Participants: physicians and nurses. Phases: (1) design of the first version of the questionnaire using the Delphi technique; (2) construction of the second version of 21 items, after judges’ agreement and Kendall's W test; (3) pilot study: internal consistency using Cronbach's alpha and omega coefficient, retest–test by Pearson's correlation coefficient; (4) validation: Barlett's spherity test and Kaiser–Meyer–Olkin measurement, exploratory factor analysis with varimax rotation and study of the dimensions of the questionnaire (number, CCI and correlation), internal consistency using Cronbach's alpha. Results: Pilot study with 28 professionals. Reliability ɷ = 0.917, α = 0.841, and test–retest correlation coefficient of 0.785 (95% confidence interval: 0.587–0.894; p < 0.001). Validation of the questionnaire (21 items) in 204 professionals. Ítem analysis and exploratory factor analysis (Barlett's test [χ2 = 1298,789] and KMO = 0.808; p < 0.001) yielded a five-factor model explaining 64.377% of the total variance, with 18 items grouped into 5 dimensions (information, preferences, behavioral intention, training and communication). Cronbach's alpha of the global questionnaire was 0.841. Conclusions: The ProPAD-pro questionnaire has showed to be a valid and reliable instrument to assess the quality of the advance care planning process.