Table 1. Characteristics of live births and stillbirths by mode of conception.
| Live births, spontaneous | Live births, assisted conception | Stillbirths, spontaneous | Stillbirths, assisted conception | |
| N | 299356 | 5869 | 1690 | 80 |
| Maternal age, years, mean (SD)† ‡ | 29.2 (4.8) | 33.0 (4.2) | 29.4 (5.3) | 33.2 (4.2) |
| Age, N (%)† ‡ | ||||
| 20–24 years | 62307 (20.8) 112974 (37.7) | 132 (2.2) | 388 (23.0) | 1 (1.3) |
| 25–29 years | 1306 (22.3) () | 579 (34.3) | 16 (20.0) | |
| 30–34 years | 87985 (29.4) | 2586 (44.1) | 440 (26.0) | 37 (46.3) |
| 35–39 years | 31167 (10.4) | 1541 (26.3) | 228 (13.5) | 22 (27.5) |
| 40+ | 4923 (1.6) | 304 (5.2) | 55 (3.3) | 4 (5.0) |
| Primigravid, N (%)† | 202218 (67.6) | 3658 (62.3) | 977 (57.8) | 48 (60.0) |
| Parity, N (%)† ‡ | ||||
| 0 | 112216 (37.5) | 3824 (65.2) | 712 (42.1) | 63 (78.8) |
| 1 | 108474 (36.2) | 1604 (27.3) | 471 (27.9) | 9 (11.3) |
| 2+ | 78666 (26.3) | 441 (7.5) | 507 (30.0) | 8 (10.0) |
| Sex ratio (M∶F) | 1.061 | 1.013 | 1.069 | 0.951 |
| Multiple gestation, N (%)† ‡ | 7227 (2.4) | 1808 (30.8) | 150 (8.9) | 42 (52.5) |
| Multiple birth, N (%)† ‡ | 7215 (2.4) | 1609 (27.4) | 147 (8.7) | 35 (43.8) |
SD: standard deviation. IQR: interquartile range.
Significantly different between groups for the comparison between spontaneous and assisted conception live births (p<0.05).
Significantly different between groups for the comparison between spontaneous and assisted conception stillbirths (p<0.05).