Table 2. Risk factors for asthma in the 20s age band.

Potential risk factors	Univariate analysis				Multivariate analysis
	Adjusted OR	95% CI	P value		Adjusted OR	95% CI	P value
Sex (male)	1.51	1.15–1.99	0.003		1.43	1.00–2.04	0.05
Higher income	1.02	0.76–11.40	0.92		1.03	0.75–1.40	0.87
Higher education	1.04	0.72–1.48	0.85		0.98	0.64–1.50	0.94
Allergic rhinitis	3.14	2.34–4.21	<0.001		2.78	2.03–3.81	<0.001
Atopic dermatitis	4.44	3.23–6.10	<0.001		4.13	2.85–5.98	<0.001
Ever-smokers	1.42	1.09–1.86	0.01		1.32	0.93–1.88	0.12
Environmental tobacco smoking	0.83	0.58–1.19	0.32		1.23	0.78–1.94	0.37
Obesity	1.34	1.00–1.79	0.05		0.99	0.70–1.38	0.93

This table covers 5,641 subjects with information on allergic diseases (allergic rhinitis and atopic dermatitis). Higher income: top two quartiles of income divided by quartiles; higher education: above two or three years of college; ever-smokers: smoked more than 100 cigarettes in the past or now smoking daily or occasionally; obesity: BMI ≥25.0 kg/m² (BMI = weight in kilograms/square of height in meters). BMI, body mass index; CI, confidence interval; OR, odds ratio.