Skip to main content

Table 3 Magnitude of effect sizes

From: Interpreting small treatment differences from quality of life data in cancer trials: an alternative measure of treatment benefit and effect size for the EORTC-QLQ-C30

  All Stat. siga
Mean Difference n (%) n (%)
Trivial: 0–3 points 59 (66 %) 6 (19 %)
Small: 3 to 7 points 27 (30 %) 22 (69 %)
Medium: 10 to 15 points 2 (2 %) 2 (6 %)
Large: >15 points 2 (2 %) 2 (6 %)
Total 90 32
Odds ratio   
0.95 – 1.05 or 1.0 – 1.05 35 (39 %) 0
0.90 – 0.95 or 1.05 – 1.10 33 (37 %) 7 (33 %)
0.80 – 0.90 or 1.10 – 1.20 19 (21 %) 11 (52 %)
<0.80 or > 1.20 3 (3 %) 3 (14 %)
Total 90 31
  1. aMDs or ORs statistically significant at the 5 % level