Characteristics of live singleton and twin births and their mothers, who delivered at 24 to 42 weeks’ gestation in Ontario, 2002 to 2011
| East Asian maternal place of birth | ||||||
| Characteristic | China (n=42 517) | Hong Kong (n=5618) | South Korea (n=5148) | Vietnam (n=15 297) | Philippines (n=27 946) | Canadian maternal country of birth (n=858 654) |
| Of the mother | ||||||
| Mean (SD) age, years | 32.3 (4.7) | 33.5 (4.3) | 32.1 (3.9) | 31.4 (4.8) | 32.6 (5.4) | 29.5 (5.5) |
| Age category, years | ||||||
| <20 | 81 (0.2) | 17 (0.3) | 7 (0.1) | 68 (0.4) | 353 (1.3) | 38 920 (4.5) |
| 20–34 | 28 163 (66.2) | 3346 (59.6) | 3801 (73.8) | 11 178 (73.1) | 17 042 (61.0) | 662 500 (77.2) |
| ≥35 | 14 273 (33.6) | 2255 (40.1) | 1340 (26.0) | 4051 (26.5) | 10 551 (37.8) | 157 234 (18.3) |
| Parity | 1 (0–1) | 0 (0–1) | 1 (0–1) | 1 (0–1) | 1 (0–1) | 1 (0–1) |
| 0 | 21 160 (49.8) | 3104 (55.3) | 2552 (49.6) | 6809 (44.5) | 12 698 (45.4) | 389 635 (45.4) |
| 1 | 17 836 (42.0) | 2023 (36.0) | 1990 (38.7) | 5984 (39.1) | 9905 (35.4) | 304 847 (35.5) |
| 2 | 3012 (7.1) | 413 (7.4) | 505 (9.8) | 1896 (12.4) | 3921 (14.0) | 111 814 (13.0) |
| 3 | 410 (1.0) | 59 (1.1) | 78 (1.5) | 470 (3.1) | 1047 (3.7) | 33 591 (3.9) |
| ≥4 | 99 (0.2) | 19 (0.3) | 23 (0.4) | 138 (0.9) | 375 (1.3) | 18 767 (2.2) |
| Marital status | ||||||
| Married/common law | 36 668 (86.2) | 5205 (92.6) | 4829 (93.8) | 10 899 (71.2) | 22 304 (79.8) | 578 402 (67.4) |
| Unmarried | 3764 (8.9) | 236 (4.2) | 107 (2.1) | 2388 (15.6) | 3125 (11.2) | 132 698 (15.5) |
| Unknown | 2085 (4.9) | 177 (3.2) | 212 (4.1) | 2010 (13.1) | 2517 (9.0) | 147 554 (17.2) |
| Residential income quintile (Q) | ||||||
| Q1 (lowest) | 12 391 (29.1) | 512 (9.1) | 1183 (23.0) | 4091 (26.7) | 8992 (32.2) | 150 194 (17.5) |
| Q2 | 11 092 (26.1) | 1119 (19.9) | 976 (19.0) | 3454 (22.6) | 6770 (24.2) | 159 370 (18.6) |
| Q3 | 7328 (17.2) | 1193 (21.2) | 1021 (19.8) | 3336 (21.8) | 5445 (19.5) | 177 349 (20.7) |
| Q4 | 6236 (14.7) | 1487 (26.5) | 1021 (19.8) | 2526 (16.5) | 4183 (15.0) | 192 726 (22.4) |
| Q5 (highest) | 3971 (9.3) | 1148 (20.4) | 852 (16.6) | 1387 (9.1) | 2342 (8.4) | 166 173 (19.4) |
| Unknown | 1499 (3.5) | 159 (2.8) | 95 (1.8) | 503 (3.3) | 214 (0.8) | 12 842 (1.5) |
| Of the newborn infant | ||||||
| Female sex | 20 519 (48.3) | 2703 (48.1) | 2444 (47.5) | 7381 (48.3) | 13 491 (48.3) | 418 726 (48.8) |
| Twin births | 901 (2.1) | 156 (2.8) | 105 (2.0) | 286 (1.9) | 554 (2.0) | 29 075 (3.4) |
All data are presented as a number (%) unless otherwise indicated.