Male and female live births in Ontario, 1993–2012, by maternal birthplace and by sex of previous live born sibling(s)
| Maternal birthplace; birth order | Sex of previous sibling(s) | All live births | ||
|---|---|---|---|---|
| No. of live births | No. of males/ females | Male:female ratio (95% CI) | ||
| Canada | ||||
| 1 | – | 540 552 | 276 697/263 855 | 1.05 (1.04 to 1.05) |
| 2 | M | 166 438 | 86 069/80 369 | 1.07 (1.06 to 1.08) |
| F | 158 120 | 80 376/77 744 | 1.03 (1.02 to 1.04) | |
| 3 | MM | 26 717 | 13 824/12 893 | 1.07 (1.05 to 1.10) |
| FF | 23 749 | 12 089/11 660 | 1.04 (1.01 to 1.06) | |
| MF or FM* | 40 223 | 20 718/19 505 | 1.06 (1.04 to 1.08) | |
| India | ||||
| 1 | – | 24 170 | 12 134/12 036 | 1.01 (0.98 to 1.03) |
| 2 | M | 6 491 | 3 390/3 101 | 1.09 (1.04 to 1.15) |
| F | 7 012 | 3 635/3 377 | 1.08 (1.03 to 1.13) | |
| 3 | MM | 439 | 227/212 | 1.07 (0.89 to 1.29) |
| FF | 1 262 | 836/426 | 1.96 (1.75 to 2.21) | |
| MF or FM* | 1 002 | 541/461 | 1.17 (1.04 to 1.33) | |
| China | ||||
| 1 | – | 19 694 | 10 173/9 521 | 1.07 (1.04 to 1.10) |
| 2 | M | 4 335 | 2 237/2 098 | 1.07 (1.01 to 1.13) |
| F | 4 244 | 2 200/2 044 | 1.08 (1.01 to 1.14) | |
| 3 | MM | 262 | 128/134 | 0.96 (0.75 to 1.22) |
| FF | 396 | 199/197 | 1.01 (0.83 to 1.23) | |
| MF or FM* | 385 | 201/184 | 1.09 (0.89 to 1.33) | |
| Other South Asian countries | ||||
| 1 | – | 27 475 | 13 948/13 527 | 1.03 (1.01 to 1.06) |
| 2 | M | 8 333 | 4 208/4 125 | 1.02 (0.98 to 1.07) |
| F | 8 220 | 4 073/4 147 | 0.98 (0.94 to 1.03) | |
| 3 | MM | 1 324 | 670/654 | 1.02 (0.92 to 1.14) |
| FF | 1 448 | 713/735 | 0.97 (0.88 to 1.08) | |
| MF or FM* | 2 372 | 1 200/1 172 | 1.02 (0.95 to 1.11) | |
| Other Asian countries | ||||
| 1 | – | 21 564 | 11 119/10 445 | 1.07 (1.04 to 1.09) |
| 2 | M | 5 592 | 2 968/2 624 | 1.13 (1.07 to 1.19) |
| F | 5 354 | 2 733/2 621 | 1.04 (0.99 to 1.10) | |
| 3 | MM | 725 | 352/373 | 0.94 (0.82 to 1.09) |
| FF | 716 | 375/341 | 1.10 (0.95 to 1.27) | |
| MF or FM* | 1 014 | 526/488 | 1.08 (0.95 to 1.22) | |
| Rest of the world | ||||
| 1 | – | 65 046 | 33 340/31 706 | 1.05 (1.04 to 1.07) |
| 2 | M | 18 193 | 9 328/8 865 | 1.05 (1.02 to 1.08) |
| F | 17 440 | 8 937/8 503 | 1.05 (1.02 to 1.08) | |
| 3 | MM | 2 899 | 1 487/1 412 | 1.05 (0.98 to 1.13) |
| FF | 2 801 | 1 411/1 390 | 1.02 (0.94 to 1.09) | |
| MF or FM* | 4 926 | 2 508/2 418 | 1.04 (0.98 to 1.10) | |
| Total | 1 220 933 | 625 570/595 363 | 1.05 (1.05 to 1.05) | |
Note: CI = confidence interval, FF = both previous living siblings were female, MM = both previous living siblings were male.
↵* Values were collapsed because we found no differences by birth order of the sex of the previous 2 siblings (MF v. FM).