The Prevalence of Asthma and Respiratory Symptoms among Cross-Country Skiers in Early Adolescence
Table 1
Demographic and clinical characteristics of Swedish cross-country skiers in early adolescence and a population-based reference group.
Cross-country skiers
References
-value
All n = 87
Boys n = 41
Girls n = 46
All n = 292
Boys n = 159
Girls n = 133
Age, mean (SD)
12.83 (0.69)
12.73 (0.74)
12.91 (0.63)
13.64 (0.64)
13.68 (0.68)
13.59 (0.59)
<0.001
Self-reported asthma
20 (23)
9 (22)
11 (24)
36 (12)
23 (14)
13 (10)
0.014
Current wheezing
22 (25)
13 (32)
9 (20)
42 (14)
28 (18)
14 (11)
0.017
Wheezing without a common cold
17 (20)
10 (24)
7 (15)
27 (9)
19 (12)
8 (6)
0.009
Exercise-induced wheezing
18 (21)
10 (24)
8 (17)
33 (11)
22 (14)
11 (8)
0.024
Smoking in family
0 (0)
0 (0)
0 (0)
42 (14)
20 (13)
22 (17)
<0.001
BMI, median (IQR)
19 (18–20)
18 (18-19)
19 (18–20)
20 (18–22)
20 (18–21)
20 (18–22)
<0.001
Exercise (hours/week), median (IQR)
6 (5–8)
6 (5–8)
6 (5–7)
4 (3–7)
5 (3–7)
4 (2–6)
<0.001
Data are presented as n (%), unless otherwise stated. Significant -values in bold. SD; standard deviation. IQR; interquartile range. Comparison between cross-country skiers (all) and reference group members (all).
