Unadjusted ORs for symptom onset for each predictor variable
| Predictor variable | Estimated OR (95% CI) | |
|---|---|---|
| Within-subject | Between-subject | |
| Sex (M=0) | 0.78 (0.60 to 1.02) | |
| Age | 1.01 (0.95 to 1.07) | 1.02 (0.99 to 1.05) |
| Team (recruit=0) | 0.87 (0.68 to 1.11) | |
| Performance level (IL=0) | 0.83 (0.63 to 1.10) | |
| Family situation (no children=0) | 0.98 (0.67 to 1.44) | |
| Summer | 1.00 | |
| Autumn | 1.63 (1.23 to 2.16)* | |
| Winter | 2.09 (1.59 to 2.73)* | |
| Spring | 2.00 (1.50 to 2.65)* | |
| General preparation phase | 1.00 | |
| Specific preparation phase | 1.28 (0.99 to 1.65) | |
| Competition phase | 1.68 (1.35 to 2.09)* | |
| Regeneration phase | 1.56 (1.02 to 2.37)# | |
| Transition phase | 1.40 (1.01 to 1.92)# | |
| International air travel | 4.53 (3.49 to 5.88)* | 1.23 (0.19 to 7.91) |
| Altitude exposure | 1.05 (1.01 to 1.10)# | 0.81 (0.52 to 1.27) |
| Competition | 2.74 (2.18 to 3.45)* | 0.53 (0.19 to 1.45) |
| Total training volume | 0.98 (0.97 to 1.00) | 0.91 (0.85 to 0.98)# |
| High-intensity endurance exercise | 1.16 (1.03 to 1.31)# | 0.57 (0.30 to 1.09) |
| Strength/power/sprint exercise | 0.83 (0.75 to 0.91)* | 0.70 (0.48 to 1.02) |
| Training monotony | 1.01 (0.99 to 1.02) | 0.86 (0.79 to 0.93)* |
| Training impulse | 1.00 (0.98 to 1.01) | 1.06 (1.00 to 1.12) |
| Training stress | 1.00 (1.00 to 1.00) | 0.97 (0.96 to 0.99)# |
Data for 7016 person-weeks from 37 elite cross-country skiers.
*p<0.001; #p<0.05.
IL, international-level athletes.