The patient enablement instrument for back pain: reliability, content validity, construct validity and responsiveness

Abstract Background Currently, there are no outcome measures assessing the ability of people with non-specific low back pain to self-manage their illness. Inspired by ‘Patient Enablement Instrument’, we developed Patient Instrument for Back Pain (PEI-BP). The aim this study was describe development (PEI-BP) and investigate content validity, construct internal consistency, test–retest reliability, measurement error, responsiveness floor ceiling effects. Methods PEI-BP consists 6 items that rated on a 0–10 Numeric Rating Scale. Measurement properties were evaluated using COSMIN taxonomy based three cohorts from primary care pain: validity cohort (N = 14) which participated in semi-structured interviews, GLA:D® 272) 37) both completed self-reported questionnaires. For responsiveness, enablement compared disability (Oswestry Disability Index), beliefs (Brief Illness Perception Questionnaire), fear avoidance (Fear-Avoidance Beliefs Questionnaire—physical activity), mental health (SF-36), educational level number previous episodes pain. Results found have acceptable reliability (internal error) responsiveness. Smallest Detectable Change 10.1 points illustrating patient would change more than 1/6 scale range it be true change. A skewed distribution towards high scores at baseline indicating potentially problematic effect current population. Conclusions can considered valid reliable tool measure seeking LBP. Further testing populations severe LBP is recommended. Trial registration : Not applicable.