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 birthMaleFemaleMale vs female
Sex of preceding live birth(s)n abortions/N mothersRate/100 live birthsn abortions/N mothersRate/100 live birthsRR (95% CI)
Second generation—South Asian ethnicity, Canadian-born (n=10 273)
 No previous birth1087/296936.61028/279836.71.00 (0.92 to 1.09)
 One girl86/8749.882/8509.61.02 (0.75 to 1.38)
 One boy131/93014.1112/90012.41.13 (0.88 to 1.46)
 Two girls42/15127.816/13811.62.40 (1.35 to 4.27)
 Two boys14/12211.529/15418.80.61 (0.32 to 1.15)
 One girl, one boy37/18919.655/19827.80.70 (0.46 to 1.07)
First generation—South Asian ethnicity, born in South Asian countries (n=36 687)
 No previous birth1234/10 46411.81196/10 21611.71.01 (0.93 to 1.09)
 One girl756/342622.1654/325620.11.10 (0.99 to 1.22)
 One boy663/328720.2604/303519.91.01 (0.91 to 1.13)
 Two girls373/78447.6131/48327.11.75 (1.44 to 2.14)
 Two boys95/28932.961/28721.31.55 (1.12 to 2.13)
 One girl, one boy214/61634.7148/54427.21.28 (1.04 to 1.57)
First generation—South Asian ethnicity, born in non-South Asian countries (n=4819)
 No previous birth608/139843.5626/135346.30.94 (0.84 to 1.05)
 One girl135/43631.097/40224.11.28 (0.99 to 1.67)
 One boy120/41329.178/40119.51.49 (1.12 to 1.99)
 Two girls7/4615.2*/59**
 Two boys10/6016.722/6533.80.49 (0.23 to 1.04)
 One girl, one boy43/8749.423/9923.22.13 (1.28 to 3.53)
South Asian ethnicity, unknown generation and birthplace (n=7880)
 No previous birth320/233413.7360/228615.70.87 (0.75 to 1.01)
 One girl117/68317.1110/63217.40.98 (0.76 to 1.28)
 One boy139/60922.8121/65518.51.24 (0.97 to 1.58)
 Two girls52/15134.426/9328.01.23 (0.77 to 1.97)
 Two boys25/7135.210/7213.92.54 (1.22 to 5.28)
 One girl, one boy61/14442.438/15025.31.67 (1.12 to 2.51)
Canadian—non-South Asian ethnicity, Canadian-born (n=930 982)
 No previous birth62 496/263 12823.859 636/250 78923.81.00 (0.99 to 1.01)
 One girl8273/80 04810.38084/77 03710.50.98 (0.96 to 1.02)
 One boy8767/85 80610.28325/80 17310.40.98 (0.95 to 1.01)
 Two girls1362/12 54510.91314/12 02010.90.99 (0.92 to 1.07)
 Two boys1443/14 6319.91391/13 53110.30.96 (0.89 to 1.03)
 One girl, one boy2747/21 27512.92719/19 99913.60.95 (0.90 to 1.00)
  • *Suppressed due to counts <5 or residual disclosure.