Athlete and coach baseline characteristics
| Athlete intervention group | Athlete control group | |||
| M (SD) | N | M (SD) | N | |
| Age (years) | 22.45 (11.40) | 456 | 18.62 (7.07) | 457 |
| Gender | 444 | 462 | ||
| Female | 172 | 161 | ||
| Male | 192 | 294 | ||
| Other | 0 | 1 | ||
| Hours per week training | 6.24 (5.94) | 440 | 5.81 (5.05) | 449 |
| Years coached by current coach | 2.23 (2.24) | 427 | 1.85 (1.69) | 436 |
| Country | 457 | 462 | ||
| UK | 192 | 117 | ||
| Australia | 165 | 231 | ||
| Greece | 100 | 114 | ||
| Coach intervention group | Coach control group | |||
| Age (years) | 39.76 (14.60) | 62 | 36.82 (12.15) | 68 |
| Gender | 62 | 66 | ||
| Female | 15 | 18 | ||
| Male | 47 | 48 | ||
| Country | ||||
| UK | 23 | 23 | ||
| Australia | 19 | 25 | ||
| Greece | 20 | 20 | ||
| Years coaching team | 3.06 (3.07) | 59 | 4.27 (5.23) | 67 |
| Years coaching (in current sport) | 9.42 (7.99) | 61 | 10.33 (9.45) | 65 |
| Hours per week coaching team | 8.97 (6.92) | 60 | 9.94 (10.79) | 61 |
| Years coaching (total) | 12.15 (9.98) | 60 | 11.58 (10.34) | 65 |
| Received antidoping education | 62 | 67 | ||
| No | 44 | 41 | ||
| Yes | 18 | 26 | ||
| Sports* | ||||
| Alpine ski (GRC=8) | 8 | – | ||
| Tennis (UK=3, AUS=5, GRC=4) | 7 | 5 | ||
| Soccer (UK=3, AUS=5, GRC=9) | 7 | 10 | ||
| Softball (AUS=6) | 6 | – | ||
| Hockey (UK=1, AUS=7) | 5 | 3 | ||
| Triathlon (UK=7, AUS=1) | 5 | 3 | ||
| Athletics (UK=4, AUS=1, GRC=2) | 4 | 3 | ||
| Basketball (UK=1, GRC=14) | 4 | 11 | ||
| Swimming (UK=9, GRC=1) | 4 | 6 | ||
| Rugby league (UK=9) | 3 | 6 | ||
| Futsal (AUS=5) | – | 5 | ||
| Synchronised swimming (UK=1, AUS=4) | – | 5 | ||
*Sports represented by two or less coaches in each condition, excluded from the main table, included netball, cricket, Australian football, cycling, table tennis, rugby union, badminton, ice skating, judo and squash.