Table 3. Median, range and interquartile range for standardized percentage difference where sample recalculation was feasible (n = 121).
| N | median | min | max | IQR | |
| Journal | |||||
| AJODO | 16 | 3.5 | −93.3 | 45.0 | 38.5 |
| BJOMS | 1 | 19.3 | 19.3 | 19.3 | 0.0 |
| IJP | 6 | 22.2 | −53.5 | 67.6 | 85.6 |
| JCP | 64 | 19.1 | −237.5 | 61.9 | 30.7 |
| JE | 14 | 11.3 | −73.3 | 84.2 | 23.7 |
| JADA | 5 | 46.7 | −66.0 | 65.5 | 16.6 |
| JDR | 15 | 15.2 | −232.2 | 72.2 | 40.0 |
| Continent | |||||
| Europe | 67 | 12.5 | −237.5 | 84.2 | 33.3 |
| Americas | 35 | 12.9 | −73.3 | 72.2 | 51.5 |
| Asia/other | 19 | 20.0 | −140.0 | 67.6 | 29.1 |
| No. authors | |||||
| 1–4 | 29 | 4.0 | −237.5 | 84.2 | 67.4 |
| 5–7 | 66 | 19.3 | −132.3 | 67.6 | 27.3 |
| >7 | 26 | 13.8 | −232.2 | 72.2 | 28.8 |
| Trial design | |||||
| Cluster | 4 | 4.3 | −11.1 | 22.6 | 30.7 |
| Crossover | 12 | 28.2 | 3.2 | 84.2 | 41.3 |
| Factorial | 1 | 26.4 | 26.4 | 26.4 | 0.0 |
| Non-inferiority | 5 | −4.9 | −232.2 | 25.3 | 37.6 |
| Parallel | 86 | 9.1 | −237.5 | 72.2 | 38.8 |
| Splitmouth | 13 | 48.4 | −80.0 | 65.5 | 31.3 |
| Methodologist involvement | |||||
| No | 83 | 19.4 | −237.5 | 84.2 | 40.0 |
| Yes | 38 | 4.5 | −232.2 | 46.1 | 39.6 |
| Center | |||||
| Single Center | 90 | 12.7 | −237.5 | 84.2 | 40.1 |
| Multi Center | 31 | 18.2 | −232.2 | 67.6 | 21.9 |
| Significance | |||||
| No | 53 | 19.4 | −237.5 | 72.2 | 32.1 |
| Yes | 68 | 12.5 | −232.2 | 84.2 | 40.3 |
| No. arms | |||||
| 2 | 103 | 14.3 | −237.5 | 84.2 | 35.0 |
| 3 | 10 | 10.2 | −132.3 | 58.3 | 44.6 |
| 4 | 6 | 30.7 | −42.9 | 55.6 | 88.4 |
| 5 | 1 | 4.2 | 4.2 | 4.2 | 0.0 |
| 8 | 1 | 26.4 | 26.4 | 26.4 | 0.0 |
| Total | 121 | 15.2 | −237.5 | 84.2 | 35.0 |