Table 3
Association between asthma and WHR
Variables	Asthma confirmed by BHR			Previous asthma diagnosis
	N	cases	OR (95% CI)	N	cases	OR (95% CI)
WHR	1920	200		1920	284
< 0.50	1268	131	1	1268	166	1
≥ 0.50	652	69	1.02 (0.74 – 1.40)	652	118	1.48 (1.13 – 1.93)
Physical activity	1922	200		1922	284
Active	1113	97	1	1113	149	1
Inactive	809	103	1.16 (0.85 - 1.58)	801	135	1.35 (1.04 – 1.76)
Gender	1922	200		1922	284
Male	942	67	1	942	144	1
Female	980	133	2.16 (1.56 – 3.01)	980	140	0.90 (0.69 – 1.18)
Smoking habit	1922	200		1922	284
Non-smokers	1588	156	1	1588	234	1
Smokers	334	44	1.47 (1.02 – 2.13)	334	50	1.00 (0.71 - 1.40)
Schooling (years)	1922	200		1922	294
≥ 12	282	45	1	282	35	1
9-11	978	118	0.74 (0.51 – 1.08)	978	144	1.28 (0.86 – 1.91)
≤ 8	662	37	0.36 (0.19 – 0.49)	662	105	1.49 (0.98 – 2.26)

N: number of subjects.

cases: numbers of subjects with asthma in every category.

CI: confidence interval.

OR: odds ratio.

WHR: waist-to-height ratio.

BHR: bronchial hyperresponsiveness.

Analysis was adjusted for gender, socioeconomic level, smoking status and physical activities.

Multivariate analysis.

Cetlin et al. BMC Public Health 2012 12:844   doi:10.1186/1471-2458-12-844