Table 1.
Characteristics of twins and singletons in Taiwan. Figures are means (SD) unless stated otherwise
| Variables | Singletons | Twins |
|---|---|---|
| No of live births | 218 972 | 1687 |
| No (%) male | 109 619 (50.1) | 823 (48.8) |
| Mean (SD) birth weight (g) | 3287 (440) | 2570 (473) |
| No (%) with low birth weight (<2500 g) | 6300 (2.9) | 691 (41.0) |
| No (%) premature (≤37 weeks) | 9901 (4.5) | 541 (32.1) |
| Gestational age (weeks) | 39.7 (1.3) | 38.1 (2.2) |
| Birth order | 1.8 (0.9) | 1.9 (1.0) |
| Maternal age (years) | 26.8 (3.7) | 27.6 (3.9) |
| Paternal age (years) | 29.8 (4.5) | 30.7 (4.8) |
| Maternal education (years) | 10.4 (3.3) | 10.9 (3.2) |
| Paternal education (years) | 11.4 (3.3) | 11.9 (3.3) |
| No (%) employed in public sector: | ||
| Mothers | 19 949 (9.1) | 194 (11.5) |
| Fathers | 191 148 (12.7) | 237 (14.0) |