Table 1.
Rate ratios (RRs) and 95% CIs for prior abortion comparing the sex of the index child, stratified by the sex of the preceding live birth for second-generation and first-generation mothers of South Asian ethnicity and Canadian-born mothers
| Index birth | Male | Female | Male vs female | ||
| Sex of preceding live birth(s) | n abortions/N mothers | Rate/100 live births | n abortions/N mothers | Rate/100 live births | RR (95% CI) |
| Second generation—South Asian ethnicity, Canadian-born (n=10 273) | |||||
| No previous birth | 1087/2969 | 36.6 | 1028/2798 | 36.7 | 1.00 (0.92 to 1.09) |
| One girl | 86/874 | 9.8 | 82/850 | 9.6 | 1.02 (0.75 to 1.38) |
| One boy | 131/930 | 14.1 | 112/900 | 12.4 | 1.13 (0.88 to 1.46) |
| Two girls | 42/151 | 27.8 | 16/138 | 11.6 | 2.40 (1.35 to 4.27) |
| Two boys | 14/122 | 11.5 | 29/154 | 18.8 | 0.61 (0.32 to 1.15) |
| One girl, one boy | 37/189 | 19.6 | 55/198 | 27.8 | 0.70 (0.46 to 1.07) |
| First generation—South Asian ethnicity, born in South Asian countries (n=36 687) | |||||
| No previous birth | 1234/10 464 | 11.8 | 1196/10 216 | 11.7 | 1.01 (0.93 to 1.09) |
| One girl | 756/3426 | 22.1 | 654/3256 | 20.1 | 1.10 (0.99 to 1.22) |
| One boy | 663/3287 | 20.2 | 604/3035 | 19.9 | 1.01 (0.91 to 1.13) |
| Two girls | 373/784 | 47.6 | 131/483 | 27.1 | 1.75 (1.44 to 2.14) |
| Two boys | 95/289 | 32.9 | 61/287 | 21.3 | 1.55 (1.12 to 2.13) |
| One girl, one boy | 214/616 | 34.7 | 148/544 | 27.2 | 1.28 (1.04 to 1.57) |
| First generation—South Asian ethnicity, born in non-South Asian countries (n=4819) | |||||
| No previous birth | 608/1398 | 43.5 | 626/1353 | 46.3 | 0.94 (0.84 to 1.05) |
| One girl | 135/436 | 31.0 | 97/402 | 24.1 | 1.28 (0.99 to 1.67) |
| One boy | 120/413 | 29.1 | 78/401 | 19.5 | 1.49 (1.12 to 1.99) |
| Two girls | 7/46 | 15.2 | */59 | * | * |
| Two boys | 10/60 | 16.7 | 22/65 | 33.8 | 0.49 (0.23 to 1.04) |
| One girl, one boy | 43/87 | 49.4 | 23/99 | 23.2 | 2.13 (1.28 to 3.53) |
| South Asian ethnicity, unknown generation and birthplace (n=7880) | |||||
| No previous birth | 320/2334 | 13.7 | 360/2286 | 15.7 | 0.87 (0.75 to 1.01) |
| One girl | 117/683 | 17.1 | 110/632 | 17.4 | 0.98 (0.76 to 1.28) |
| One boy | 139/609 | 22.8 | 121/655 | 18.5 | 1.24 (0.97 to 1.58) |
| Two girls | 52/151 | 34.4 | 26/93 | 28.0 | 1.23 (0.77 to 1.97) |
| Two boys | 25/71 | 35.2 | 10/72 | 13.9 | 2.54 (1.22 to 5.28) |
| One girl, one boy | 61/144 | 42.4 | 38/150 | 25.3 | 1.67 (1.12 to 2.51) |
| Canadian—non-South Asian ethnicity, Canadian-born (n=930 982) | |||||
| No previous birth | 62 496/263 128 | 23.8 | 59 636/250 789 | 23.8 | 1.00 (0.99 to 1.01) |
| One girl | 8273/80 048 | 10.3 | 8084/77 037 | 10.5 | 0.98 (0.96 to 1.02) |
| One boy | 8767/85 806 | 10.2 | 8325/80 173 | 10.4 | 0.98 (0.95 to 1.01) |
| Two girls | 1362/12 545 | 10.9 | 1314/12 020 | 10.9 | 0.99 (0.92 to 1.07) |
| Two boys | 1443/14 631 | 9.9 | 1391/13 531 | 10.3 | 0.96 (0.89 to 1.03) |
| One girl, one boy | 2747/21 275 | 12.9 | 2719/19 999 | 13.6 | 0.95 (0.90 to 1.00) |
*Suppressed due to counts <5 or residual disclosure.