Table 1 Demographic characteristics of the pregnant women at baseline (N = 443).
From: Association of ambient air pollutants with maternal thyroid hormones during the entire pregnancy
Variables | N (%) or mean ± SD |
|---|---|
Age, years (mean ± SD) | 29.17 ± 4.81 |
Pre-pregnancy BMI, kg/m2 (N, %) | |
< 18.5 | 60 (13.54) |
18.5–23.9 | 297 (67.04) |
≥ 24 | 86 (19.41) |
Education (N, %) | |
High school or lower | 239 (53.95) |
College or higher | 204 (46.05) |
Ethnic (N, %) | |
Han | 432 (97.52) |
Other | 11 (2.48) |
Occupation (N, %) | |
Non-manual labor | 147 (33.18) |
Manual labor | 296 (66.82) |
Income per year, yuan (N, %) | |
< 100,000 | 158 (35.67) |
≧ 100,000 | 285 (64.33) |
Smoking (N, %) | |
Yes | 8 (1.81) |
No | 435 (98.19) |
Passive smoking (N, %) | |
Yes | 119 (26.86) |
No | 324 (73.14) |
Drinking (N, %) | |
Yes | 29 (6.55) |
No | 414 (93.45) |
TPOAb (N, %) | |
Negative | 404 (91.20) |
Positive | 39 (8.80) |
TgAb (N, %) | |
Negative | 404 (91.20) |
Positive | 39 (8.80) |
