Small, medium and large treatment effects for all eight effect size indices
| Effect size index | Small effect | Medium effect | Large effect |
| SMD | 0.20 | 0.50 | 0.80 |
| MD | 0.50 points | 1.25 points | 2.00 points |
| MID unit | 0.50 | 1.25 | 2.00 |
| RoM | 0.90 (10%) | 0.75 (25%) | 0.60 (40%) |
| RR | 1.30 (30% more) | 1.80 (80% more) | 2.40 (140% more) |
| RD | 0.06 (6%) | 0.17 (17%) | 0.28 (28%) |
| CER and EER | 0.20/0.26 (20%/26%) | 0.20/0.37 (20%/37%) | 0.20/0.48 (20%/48%) |
| NNT | 16.50 | 6.00 | 3.50 |
CER&EER, control event rate and experimental event rate; MD, mean difference; MID unit, difference in minimal importance difference units; NNT, number needed to treat; RD, risk difference; RoM, ratio of means; RR, risk ratio; SMD, standardised mean difference.