Table 3. Relationship between swimming school attendance at 3y and current wheeze at 5y.

	Unadjusted OR		Adjusted ORa		Multiple imputation
	OR (95% CI)	P value	OR (95% CI)	P value	OR (95% CI)	P value
Swimming lessons at 3y (-)	1		1		1
Swimming lessons at 3y (+)	0.72 (0.41–1.25)	0.239	0.83 (0.43–1.60)	0.575	0.74 (0.42–1.30)	0.296

CI: confidence interval, OR: odds ratio, 3y: age 3 years, 5y: age 5 years

Statistical analysis was done using multivariable logistic regression analysis.

^aOR adjusted for sex, birth weight, sibling(s), pet ownership, environmental tobacco smoke exposure at 3y, television(TV) viewing at 3y, income, maternal education level, maternal age, maternal asthma, atopic dermatitis or rhinitis, breastfeeding before age 6 months, and BMI Z-score at 3y.