From: Validity, reliability, and responsiveness of the Swedish version of Western Ontario Osteoarthritis of the Shoulder index
Excellent
Adequate
Poor
Cronbach´s α
≥ 0.80
0.70–0.79
< 0.70
PCC
≥ 0.60
0.30–0.59
< 0.30
Floor and Ceiling effects
No effects
≤ 20%
> 20%
ES and SRM
0.50–0.79
< 0.50