Table 1.
Baseline socio-demographic characteristics of the subjects in the Taiwan Birth Panel Study
| Characteristics, N (%) | TBPS study | Population-based survey |
|---|---|---|
| Total | 486 | 21,248 |
| Mother's characteristics | ||
| Maternal age (%) | ||
| <25 years | 9.9 | 22.3 |
| 25-29 years | 26.7 | 37.4 |
| 30-34 years | 40.9 | 29.4 |
| ≥35 years | 22.4 | 10.8 |
| Maternal education (%) | ||
| Junior high school and below | 9.3 | 14.8 |
| Senior high school | 46.3 | 39.9 |
| College and above | 44.4 | 45.3 |
| Ethnic origin | ||
| Taiwanese | 91.8 | 86.6 |
| Foreign-born | 8.2 | 13.4 |
| Parity (%) | ||
| Primipara | 47.3 | 50.4 |
| Multipara | 52.7 | 46.6 |
| Family characteristics | ||
| Marital status (%) | ||
| Married | 97.5 | 97.1 |
| Unmarried | 2.5 | 2.8 |
| Annual family income (%, NT$) | ||
| < 600,000 | 27.6 | 41.7 |
| 600,000-1,000,000 | 32.5 | 36.6 |
| 1,000,000-1,500,000 | 24.5 | 14.5 |
| ≥ 1,500,000 | 15.4 | 7.2 |
| Infant's characteristics | ||
| Plurality (%) | ||
| Singleton | 98.8 | 97.4 |
| Twin | 1.2 | 2.6 |
| Infant gender (%) | ||
| Male | 50.8 | 52.5 |
| Female | 49.2 | 47.5 |
| Birth outcomes | ||
| Gestational age (week, mean ± SD) | 38.5 ± 1.7 | 38.4 ± 1.6 |
| Birth weight (g, mean ± SD) | 3157.9 ± 476.6 | 3104.2 ± 448.1 |