Dependent variable
Patient experience was dichotomised to form a binary outcome. In the 1458 participants with 15 or more responses to the IAPS questionnaire, the ‘least positive’ experience was defined as having a mean IAPS score of ≥ 2.32, corresponding to the 90th percentile. As the 90th percentile fell within a group of individuals, 1291 patients were included in the 'positive' (89%) and 167 in the 'least positive' (11%) experience categories.