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Table 2 Statistical methods and their interpretations [12, 13]

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

 ≥ 0.80

0.50–0.79

 < 0.50

  1. PCC Pearson’s correlation coefficient, ES effect size, SRM standardized response mean