Reliability and validity of an ambulance patient reported experience measure (a-prem): pilot study

Background There are no prehospital ambulance Patient Reported Experience Measures (A-PREMs) routinely used to support service comparisons and improvement. We developed an A-PREM, generating items through secondary analysis of ambulance patient interview data, and refining the instrument using expert assessment and cognitive interviews of service users. We aimed to pilot the A-PREM (48 experience and 12 attribute items) investigating user acceptability, reliability and construct validity. Methods Ambulance users attended by a UK regional ambulance service within the previous six months, excluding those suffering cardiac arrest, were sent a self-administered A-PREM. Returned questionnaires were entered into Microsoft Excel and imported into SPSS v22 for analysis. Experience items were recoded to range from 0 (don’t know/can’t remember) to 3 (best recorded experience). Descriptive analysis for item frequencies and missing values, reliability analyses for potential scales and tests of correlation and association were conducted. Results In all, 111 A-PREMs (22.2%) were returned. Missing data were highest for call-taking items. There was a significant association with a shorter wait for first response for four items measuring overall experience of call-taking (χ, p=0.05), ambulance staff (p