Table E2.

Baseline characteristics of subjects with IgE measurements in all 3 ECRHSs versus subjects with IgE measurements in baseline survey only from same centers

	With IgE measurements in baseline survey only (n = 7272)	With IgE measurements in all 3 surveys (n = 3206)	Adjusted∗ odds for responding (95% CI)	P value for heterogeneity‡
Age at baseline (per 10 y)	—	—	1.40 (1.29-1.52)	.036
Female sex (%)	49.9	50.0	1.00 (0.19-1.11)	.17
Smoking status at baseline (%)
Lifetime nonsmoker	41.6	45.1	1.00
Exsmoker	21.1	22.6	0.88 (0.78-1.01)	.29
Current smoker	37.3	32.3	0.65 (0.58-0.73)	.38
Symptoms in the last 12 mo
Wheeze	22.2	19.8	0.97 (0.84-1.11)	.12
Woken with shortness of breath	6.4	4.8	0.76 (0.61-0.94)	.40
Sensitized to ≥1 allergen† (%)	29.5	27.9	1.05 (0.91-1.22)	.0017

^∗From meta-analysis by center, adjusting for all other factors in the table.

^†House dust mite, cat, or grass.

^‡From random-effects meta-analysis.