| Consumption of the nutritional supplements (NS) | Yes (1) | 13 | 30.2 | 7 | 33.3 |  | 
| Yes. but not regularly (2) | 30 | 69.8 | 9 | 42.9 |  | 
| No (3) | 0 | 0.0 | 4 | 19.0 | 1.02 | 
| Missing | 0 | 0.0 | 1 | 4.8 |  | 
| Trust in coaches regarding NS | Yes | 29 | 67.4 | 12 | 57.1 |  | 
| No | 14 | 32.6 | 8 | 38.1 |  | 
| Trust in physicians regarding NS | Yes | 31 | 72.1 | 13 | 61.9 | 31 | 
| No | 12 | 27.9 | 7 | 33.3 | 12 | 
| Missing | 0 | 0.0 | 1 | 4.8 | 0 | 
| Primary source of information on nutrition and NS supplements | I have no knowledge on this problem | 5 | 11.6 | 2 | 9.5 |  | 
| Coach | 24 | 55.8 | 12 | 57.1 |  | 
| Formal education (school, professional seminars. etc.) | 14 | 32.6 | 5 | 23.8 |  | 
| Self-education (internet, literature, etc.) |  |  | 2 | 9.5 |  |