Table 4– General overweight and obesity at baseline in association with incident asthma among males stratified by age (<40 and ≥40 yrs) in the Nord-Trøndelag Health Study (HUNT)

	Age <40 yrs^#			Age ≥40 yrs^¶
	Subjects n	Cases n (%)	Adjusted OR (95% CI)⁺	Subjects n	Cases n (%)	Adjusted OR (95% CI)⁺
BMI
Normal BMI <25.0 kg·m⁻²	1989	52 (2.6)	1.00	1870	40 (2.1)	1.00
General overweight 25.0–29.9 kg·m⁻²	2067	53 (2.6)	1.00 (0.67–1.47)	3277	96 (2.9)	1.45 (0.99–2.11)
General obesity ≥30.0 kg·m⁻²	439	15 (3.4)	1.28 (0.71–2.32)	8119	43 (5.3)	2.35 (1.50–3.68)
p-value for trend			0.55			0.001
BMI continuous^§	4495	120 (2.7)	1.18 (0.90–1.53)	5966	179 (3.0)	1.54 (1.25–1.90)

BMI: body mass index. ^#: n=4,495; ^¶: n=5,966; ⁺: adjusted for smoking, physical activity, education, family history of asthma, social benefits and economic difficulties at baseline;^§: BMI per 5-unit increase.