Sports adverts study quality
| Study component | N=74 | % (95% CI) |
| Number of participants | 2031 (median 15) | Range 5–387 |
| Number of men | 1310 | 64.5 (61.9 to 67.1) |
| Study quality | ||
| Control group | 55 | 74.3 (62.8 to 85.9) |
| Randomisation | 43 | 58.1 (43.4 to 72.9) |
| Allocation concealment | 5 | 6.8 (0 to 28.8) |
| Intention to treat | 22 | 29.7 (10.8 to 48.8) |
| Blinding (investigators, outcome assessors or participants) | 20 | 27.0 (7.6 to 46.5) |
| Surrogate sports outcome | 61 | 82.4 (72.9 to 92.0) |
| Repeat of the intervention | 2 | 2.7 (0 to 25.2) |
| Reporting | ||
| Clear hypothesis | 66 | 89.2 (81.7 to 96.7) |
| Power calculation | 4 | 5.4 (0 to 27.6) |
| Adverse events reported | 6 | 6.8 (0 to 32.3) |
| Study limitations discussed | 8 | 10.8 (0 to 32.3) |
| Level of evidence | ||
| 1 | 0 | 0 |
| 2 | 32 | 42.1 (25.0 to 59.2) |
| 3 | 33 | 43.4 (26.5 to 60.3) |
| 4 or 5 | 9 | 11.8 (0 to 33.0) |