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Table 1 Calculation of effect sizes (Cohen's d) for early and late treatment as assessed with scale F A and F B .

From: Additive scales in degenerative disease - calculation of effect sizes and clinical judgment

  Scale F A Scale F B
Treatment 1 early 0.4796 0.5693
Treatment 1 late 0.5736 0.6039
Treatment 2 early 0.5579 0.4624
Treatment 2 late 0,6005 0.5681
  1. In scale F A : F A (t; a i , b i , c i , i = 1, 2) = 3/8 f 1(t; a 1, b 1, c 1) + 5/8 f 2 (t; a 2, b 2, c 2). In scale F B : F B (t; a i , b i , c i , i = 1, 2) = 2/3 f 1(t; a 1, b 1, c 1) + 1/3 f 2 (t; a 2, b 2, c 2). A treatment effect of 30% is assumed for f 1 (Treatment 1) or f 2 (Treatment 2).