TABLE 2.

Interaction between body weight and insulin resistance, and current asthma

Measure of obesity	Current asthma
	Crude OR (95% CI)	Adjusted OR (95% CI)
Model 1: BMI categories
Lean	1.0 (ref.)	1.0 (ref.)
Overweight	1.01 (0.73–1.38)	1.11 (0.80–1.55)
Obese	2.20 (1.63–2.97)	2.25 (1.63–3.10)
Test for trend p-value	<0.001	<0.001
p-value for interaction between BMI and insulin resistance	0.10	0.03
Model 2: waist circumference tertiles
1st	1.0 (ref.)	1.0 (ref.)
2nd	1.19 (0.72–1.95)	1.38 (0.84–2.29)
3rd	2.17 (1.35–3.47)	2.68 (1.66–4.33)
Test for trend p-value	<0.001	<0.001
p-value for interaction between waist circumference and insulin resistance	0.03	0.01
Model 3: waist-to-height ratio tertiles
1st	1.0 (ref.)	1.0 (ref.)
2nd	0.97 (0.65–1.44)	1.10 (0.74–1.64)
3rd	2.08 (1.46–2.97)	2.29 (1.56–3.35)
Test for trend (p-value)	<0.001	<0.001
p-value for interaction between waist-to-height ratio and insulin resistance	0.11	0.02

All models adjust for age, sex, race/ethnicity, poverty income ratio and smoking status.

BMI: body mass index.

Bold odds ratios are statistically significant.