Data for: Sample size calculations are poorly conducted and reported in many randomised trials of hip and knee osteoarthritis: results of a systematic review

Data extraction on 2-arm randomised trials of hip and/or knee osteoarthritis published in 2016 including study characteristics, methods used to calculate the sample size, and the reporting, justification of components used in the sample size calculation and details of an attempt to replicate the sample size calculation using the reported information.