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Table 2 CPSW Study [7] Observed Effect Sizes for Control vs. Intervention Groups

From: Sample size and power estimation for studies with health related quality of life outcomes: a comparison of four methods using the SF-36

SF-36 Dimension Group n mean sd Mean Diff δ Δ Normal PNoether Parametric Pr(Y > X) Non-parametric
Physical Control 241 89.9 14.5 2.6 0.17 0.548 0.561
Function Intervention 254 87.3 15.8     
Role Control 241 74.3 38.1 9.1 0.23 0.566 0.568
Physical Intervention 254 65.2 39.5     
Bodily Control 241 75.6 23.7 4 0.17 0.547 0.552
Pain Intervention 254 71.6 23.8     
General Control 241 77.7 17.7 2.4 0.13 0.537 0.542
Health Intervention 254 75.3 18.5     
Vitality Control 241 51.1 20.7 1.3 0.06 0.517 0.514
  Intervention 254 49.8 21.7     
Social Control 241 81.6 22.7 4.7 0.20 0.556 0.561
Function Intervention 254 76.9 24.2     
Role Control 241 77.9 36.4 1.1 0.03 0.509 0.515
Emotional Intervention 254 76.8 35.5     
Mental Control 241 72.9 17.2 -0.2 -0.01 0.497 0.499
Health Intervention 254 73.1 16.7     
  1. Effect size Δ Normal = mean difference divided by the pooled standard deviation. Effect size pNoether Pr(YControl > XIntervention), based on U/nm, where U = MW test statistic (with allowance for ties). Parametric estimate of Pr (Y > X) based on equation 1.