Number of comparisons by sport discipline and study design
| Sport discipline | X-S | RX-S | PCS | PP-BCS | CCT | RCT | ALL |
|---|---|---|---|---|---|---|---|
| Running | 8 | 1 | 4 | 6 | 3 | 22 | |
| Football | 8 | 6 | 4 | 18 | |||
| Gymnastics | 13 | 4 | 17 | ||||
| Cycling | 5 | 4 | 9 | ||||
| Swimming | 4 | 2 | 2 | 8 | |||
| Weight-lifting | 2 | 1 | 3 | ||||
| Rowing | 2 | 1 | 3 | ||||
| Climbing | 3 | 3 | |||||
| Tennis | 1 | 1 | 2 | ||||
| Squash | 2 | 2 | |||||
| Volleyball | 2 | 2 | |||||
| Hurdling | 2 | 2 | |||||
| Golf | 1 | 1 | |||||
| Ice-skating | 1 | 1 | |||||
| Ice-hockey | 1 | 1 | |||||
| Wrestling | 1 | 1 | |||||
| Bobsled | 1 | 1 | |||||
| Canoeing | 1 | 1 | |||||
| Rugby | 1 | 1 | |||||
| Water polo | 1 | 1 | |||||
| Basketball | 1 | 1 | |||||
| Equitation | 1 | 1 | |||||
| Speed skating | 1 | 1 | |||||
| Orienteering | 1 | 1 | |||||
| C-c skiing | 1 | 1 | |||||
| Judo | 1 | 1 | |||||
| ALL | 64 | 4 | 2 | 13 | 12 | 9 | 105 |
CCT, controlled clinical trial; PCS, prospective cohort study; PP-BCS, prospective population-based cohort study; RCT, randomised controlled trial; RX-S, repeated cross-sectional; X-S, cross-sectional.