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Table 1 Standard deviations used to calculate the ES

From: Effect size varies based on calculation method and may affect interpretation of treatment effect: an illustration using randomised clinical trials in osteoarthritis

Standard deviation method

Study 1

Study 2

Study 3

WOMAC Pain subscale score

   

Pooled SD at baseline

1.19

0.92

1.11

Pooled SD at the time when the primary endpoints were assessed

2.66

2.19

2.42

Median pooled SD from baseline to the time when the primary

endpoints were assessed

2.56

2.05

2.25

  1. ES: effect size: SD: standard deviation; WOMAC: Western Ontario and McMasters Universities Osteoarthritis Index
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Advances in Rheumatology

ISSN: 2523-3106