Subject characteristics, training volume, prevalence of asthma, use of asthma medication and asthma control in cross-country skiers divided by performance level according to FIS points
| FIS points range | Skiers with FIS points n=163 | ||||||||
| Best quartile n=41 | 2nd quartile n=41 | 3rd quartile n=41 | Poorest quartile n=40 | P value between the quartiles | |||||
| 0–120.54 | 120.55–185.13 | 185.14–247.52 | 247.53–999 | ||||||
| Median/n | Q1–Q3/% | Median/n | Q1–Q3/% | Median/n | Q1–Q3/% | Median/n | Q1–Q3/% | ||
| Female subjects | 16 | 39.0 | 22 | 53.7 | 25 | 61.0 | 23 | 57.5 | 0.205 |
| Age, years | 24.1 | 22.2–27.3 | 21.2 | 18.0–27.9 | 19.8 | 18.6–24.9 | 19.1 | 17.4–24.4 | <0.001 |
| Parents or siblings with asthma | 13 | 31.7 | 18 | 43.9 | 20 | 48.8 | 15 | 37.5 | 0.419 |
| Weekly training, hours | 14.4 | 12.5–15.4 | 12.3 | 10.7–13.4 | 11.5 | 10–13.1 | 9.7 | 7.8–11.3 | <0.001 |
| Has been diagnosed with, or been investigated for, asthma | 35 | 85.3 | 29 | 70.7 | 28 | 68.3 | 26 | 65.0 | <0.001 |
| Use of any asthma medication | 25 | 61.0 | 22 | 53.7 | 16 | 39.0 | 17 | 42.5 | 0.171 |
| Current asthma | 23 | 56.1 | 17 | 41.5 | 11 | 26.8 | 12 | 30.0 | 0.028 |
| Allergic asthma (% of current asthma) | 8 | 34.8 | 8 | 47.1 | 3 | 27.2 | 5 | 41.7 | 0.730 |
| Non-allergic asthma (% of current asthma) | 15 | 65.2 | 9 | 52.9 | 8 | 72.8 | 7 | 58.3 | |
| Asthma Control Test score among subjects with current asthma | 23.0 | 18–25* | 22.0 | 18–25* | 21.8 | 19–25* | 21.8 | 17–25 | 0.522 |
*Range
FIS, International Ski Federation.