Table 3

Univariate analysis of the risk factors for current asthma in cross-country skiers and controls represented as ORs with 95% CIs

	All			Skiers			Controls
	OR	95% CI	P value	OR	95% CI	P value	OR	95% CI	P value
Being a cross-country skier	3.47	2.23 to 5.38	<0.001	NA			NA
Age (per year)	1.05	1.02 to 1.08	0.001	1.07	1.03 to 1.12	<0.001	1.04	0.99 to 1.09	0.112
100 hours more training or heavy exercise per year	1.30	1.20 to 1.40	<0.001	1.36	1.19 to 1.56	<0.001	1.01	0.82 to 1.25	0.919
Parents or siblings with asthma	2.76	1.85 to 4.11	<0.001	2.15	1.32 to 3.48	0.002	3.88	1.82 to 8.27	<0.001
Female gender	1.01	0.67 to 1.52	0.956	1.14	0.7 to 1.85	0.602	0.78	0.34 to 1.80	0.554
Allergic rhinitis	2.83	1.89 to 4.24	<0.001	2.11	1.3 to 3.43	0.003	4.89	2.17 to 11.01	<0.001
50 FIS points less	NA			1.19	1.02 to 1.39	0.03	NA