The Prevalence of Asthma and Respiratory Symptoms among Cross-Country Skiers in Early Adolescence

Table 3

Comparison between subjects with and without current wheezing among Swedish cross-country skiers in early adolescence and in a population-based reference group.

	Cross-country skiers			References
	Current wheezing n = 22	No current wheezing n = 65	-value	Current wheezing n = 42	No current wheezing n = 250	-value
BMI, median (IQR)	18 (18-19)	19 (18–20)	0.668	20 (20-21)	20 (18–22)	0.163
Exercise (hours/week), median (IQR)	6 (5–7)	6 (5–8)	0.850	5 (3–8)	4 (2–6)	0.028
Self-reported asthma	16 (73)	4 (6)	<0.001	25 (60)	11 (4)	<0.001
Parent or sibling with asthma	13 (59)	14 (22)	0.001	20 (49)	75 (31)	0.022
Smoking in family	0 (0)	0 (0)	NA	6 (14)	36 (14)	0.314

Data are presented as n (%), unless otherwise stated. Significant -values in bold. SD; standard deviation. IQR; interquartile range. Comparison between individuals with current wheezing and no current wheezing within the groups cross-country skiers and references, respectively.