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The sample information.
| Basic information | Retained sample (n = 352) | Attrition sample (n = 124) | |
|---|---|---|---|
| Gender, n (%) | male | 207 (58.8%) | 71 (57.3%) |
| female | 145 (41.2%) | 53 (42.7%) | |
| Age, M (SD) | age | 18.83 (4.27) | 18.52 (4.43) |
| Training age, M (SD) | training age | 7.01 (3.25) | 6.89 (3.46) |
| Sports grade, n (%) | master | 134 (38.1%) | 52 (41.9%) |
| first-grade | 148 (42.0%) | 48 (38.7%) | |
| second-grade | 70 (19.9%) | 24 (19.4%) | |
