Table I.

The demographic characteristics of the children with asthma and healthy controls.

Groups	Case group (n=139)	Control group (n=115)	P-value
Gender (M/F)	87/52	68/47	0.574
Age (years)	6.65±2.28	6.39±2.34	0.372
BMI (kg/cm2)	19.8±2.1	20.2±2.5	0.167
ETS, n (%)	91 (65.5%)	66 (57.4%)	0.187
Family history of asthma, n (%)	20 (14.4%)	8 (7.0%)	0.060
Urban family, n (%)	85 (61.2%)	62 (53.9%)	0.245
Exposure to dust environment, n (%)	33 (23.7%)	24 (20.9%)	0.418

M, male; F, female; BMI, body mass index; ETS, environmental tobacco smoke.