Table 2.

The risk of asthma and current wheeze in relation to frequency of indoor swimming pool attendance

	Currently attending indoor swimming pools
	Never or sometime/year (n = 883)	Some time/month (n = 1387)	Every week or more (n = 323)	P*
Physician-diagnosed asthma	9.3%	11.0%	14.7%	0.027
Current asthma	7.9%	8.7%	12.4%	0.065
Current wheeze	9.3%	11.4%	10.8%	0.332

*Test for trend conducted by Mantel-Haenszel test.

Results presented as the prevalence of asthma and wheeze, respectively, by frequency of attending indoor swimming pools.