How to read and critically appraise a reliability article

Abstract

Background This article is a guide to critically appraising reliability studies based upon fundamental reliability concepts. It focuses on reliability studies of physical measurement instruments used in the allied health professions. Content Eight critical appraisal questions specific to reliability studies are outlined, and their theoretical basis and importance described. The questions encompass key aspects of reliability theory; selection of clinically stable participants appropriate to the instrument and condition of interest; minimization of random error; appropriate periods of time between measurements; the interpretation of frequently used reliability statistics; and the generalizability of results. The importance of interpreting reliability studies in specific clinical contexts and settings is emphasized. Conclusions These questions will guide clinicians and researchers to make informed decisions regarding whether reliability evidence can be applied to their specific context.