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Table 1 Description of study population

From: Obesity and pregnancy outcomes: Do the relationships differ by maternal region of birth? A retrospective cohort study

  Australian mothers without obesity (n = 13,605) Australian mothers with obesity (n = 5163) South Asian mothers without obesity (n = 7467) South Asian mothers with obesity (n = 875)
Maternal age groups
  < 20 years 621(4.6 %) 139(2.7 %) 34(0.5 %) 4(0.5 %)
 20–30years 5846(43.0 %) 2289(44.3 %) 4062(54.4 %) 345(39.4 %)
  > 30 years 7138(52.5 %) 2735(53 %) 3371(45.1 %) 526(60.1 %)
Nulliparous 6131(45.1 %) 1887(36.5 %) 3883(52 %) 307(35.1 %)
Past caesarean 1576(11.6 %) 1007(19.5 %) 942(12.6 %) 185(21.1 %)
Private patient 2616(16.2 %) 584(11.3 %) 587(7.9 %) 57(6.5 %)
Smoking
 Smoker 2259(16.6 %) 932(18.1 %) 24(0.3 %) 2(0.2 %)
 Non-Smoker 9964(73.2 %) 3625(70.2 %) 7407(99.2 %) 860(98.3 %)
 Spontaneous quitter 1382(10.2 %) 606(11.7 %) 36(0.5 %) 13(1.5 %)
Pre-existing hypertension 96(0.7 %) 208(4.0 %) 30(0.4 %) 15(1.7 %)
Pre-existing diabetes 162(1.2 %) 121(2.3 %) 60(0.8 %) 29(3.3 %)
Pre-existing thyroid disease 284(2.1 %) 146(2.8 %) 410(5.5 %) 68(7.8 %)
Baby gender-male 6952(51.1 %) 2676(51.8 %) 3857(51.7 %) 438(50.1 %)
Gestational age
  < 37 weeks 1256(9.2 %) 501(9.7 %) 441(5.9 %) 55(6.3 %)
 37–41 + 6 weeks 12,115(89 %) 4570(88.5 %) 6927(92.8 %) 805(92 %)
  ≥ 42 weeks 234(1.7 %) 92(1.8 %) 99(1.3 %) 15(1.7 %)
  1. Number(%)
  2. Chi2 test to determine differences across the four groups. All differences were statistically significant at the p < 0.001 level
  3. Obesity defined as BMI ≥30 kg/m2