Matrix of number of trials achieving both the Cochrane risk of bias summary score and total Physiotherapy Evidence Database scale score thresholds for “acceptable” risk of bias (n), percent exact agreement, Kappa (K) and Kappa 95% confidence interval for the level of agreement between different thresholds for “acceptable” risk of bias for the Cochrane risk of bias summary score and total Physiotherapy Evidence Database scale score (N = 1442).

Cells are shaded to indicate the degree of agreement: no shading = “poor” or not calculable, gray = “slight,” dark gray = “moderate” [note: no comparisons had “fair,” “substantial” or “almost perfect” agreement].