Outcome Measures | Sample Size (A1) | Sample Size (A2) |
|---|
EQ-5D Index | 43 | 75 |
EQ-5D health status | 53 | 31 |
WOMAC pain | 75 | 52 |
WOMAC stiffness | 111 | 485 |
WOMAC function | 100 | 165 |
STS | 707 | n/a |
TUG | 76 | 1302 |
gait velocity | 274 | 148 |
step length | 265 | 105 |
gait velocityCV | 18 | 21 |
step lengthCV | 597 | 866 |
- Sample size calculations (test family = F-tests, statistical test = ANCOVA, type of power analysis = post-hoc, α = 0.05, sample size = 21, numerator df = 1, number of groups = 2, number of covariates = 6 or 7) based on the found effect sizes for the different outcomes at six-months follow-up; power (1 - β error probability) threshold = 0.8; A1: not accounting for number of therapy sessions; A2: number of therapy sessions accounted for; EQ-5D: EuroQol-5Dimensions; WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index; STS: 30 s sit to stand test; TUG: timed up and go test; CV: coefficient of variation
