Gestational Medication Use, Birth Conditions, and Early Postnatal Exposures for Childhood Asthma
Table 1
Demographic characteristics of the study population.
Case
Control
Control frequency corrected for sampling
()
()
()
Characteristics
N
%
N
%
%
Sex
Girls
84
43.5
168
43.5
1876
43.5
Boys
109
56.5
218
56.5
2436
56.5
Parental education, yr†
12
116
61.7
264
69.1
2603
60.4
13~15
41
21.8
69
18.1
888
20.6
≧16
31
16.5
49
12.8
821
19.0
Family history of asthma†
No
165
89.2
372
97.9
4212
97.7
Yes
20
10.8
8
2.1
100
2.3
Family history of atopy*†
No
101
54.6
274
72.1
3252
75.4
Yes
84
45.4
106
27.9
1060
24.6
In utero maternal smoking†
No
189
97.9
382
99.0
4162
96.5
Yes
4
2.1
4
1.0
150
3.5
*Atopy is defined as allergic rhinitis or atopic eczema. †Number of subjects does not add up to total N because of missing data. ‡Predicted number of controls in the TCHS cohort based on the sampling.