From: Pre-pregnancy Body Mass Index (BMI) and delivery outcomes in a Canadian population
Characteristic | Full sample (N) 1 | Normal weight (BMI 18.5-24.9 kg/m 2) | Overweight (BMI 25–29.9 kg/m 2) | p* | Obese (BMI ≥ 30 kg/m 2) | p †|
---|---|---|---|---|---|---|
N (%) | 1996 (100%) | 1313 (65.8%) | 472 (23.6%) | Â | 211 (10.6) | Â |
Demographics | ||||||
Maternal age | Â | Â | Â | 0.279 | Â | 0.261 |
  ≤34 years old | 1539 (78.3) | 1011 (78.5) | 356 (76.1) |  | 172 (81.9) |  |
  ≥35 years old | 427 (21.7) | 277 (21.5) | 112 (23.9) |  | 38 (18.1) |  |
Ethnicity | Â | Â | Â | 0.025 | Â | 0.005 |
  Caucasian | 1602 (80.4) | 1027 (78.4) | 392 (83.2) |  | 183 (86.7) |  |
  Other | 390 (19.6) | 283 (21.6) | 79 (16.8) |  | 28 (13.3) |  |
Household income | Â | Â | Â | 0.451 | Â | 0.035 |
  ≤ $39,000 | 139 (7.2) | 87 (6.8) | 34 (7.4) |  | 18 (8.7) |  |
  $40,000- $79,999 | 394 (20.3) | 243 (19.0) | 98 (21.4) |  | 53 (25.7) |  |
  ≥ $80,000 | 1406 (72.5) | 946 (74.1) | 325 (71.1) |  | 135 (65.5) |  |
Education | Â | Â | Â | <0.001 | Â | <0.001 |
  High school | 190 (9.5) | 108 (8.3) | 47 (10.0) |  | 35 (16.6) |  |
  Post-secondary | 1802 (90.5) | 1201 (91.7) | 425 (90.0) |  | 176 (83.4) |  |
Marital status | Â | Â | Â | 0.961 | Â | 0.450 |
  Single | 92 (4.6) | 59 (4.5) | 21 (4.4) |  | 12 (5.6) |  |
  Married/common law | 1901 (95.4) | 1251 (95.5) | 451 (95.6) |  | 199 (94.3) |  |
Lifestyle | ||||||
Smoking during pregnancy | Â | Â | Â | 0.416 | Â | 0.033 |
  No | 1894 (94.9) | 1248 (95.0) | 453 (96.0) |  | 193 (91.5) |  |
  Yes | 102 (5.1) | 65 (5.0) | 19 (4.0) |  | 18 (8.5) |  |
Alcohol use in pregnancy2 | Â | Â | Â | 0.018 | Â | 0.288 |
  No | 1981 (99.2) | 1306 (99.5) | 464 (98.3) |  | 211 (100.0) |  |
  Yes | 15 (0.8) | 7 (0.5) | 8 (1.7) |  | 0 (0.0) |  |
Recreational drugs use in pregnancy | Â | Â | Â | 0.285 | Â | 0.571 |
  No | 1992 (99.8) | 1311 (99.8) | 470 (99.6) |  | 211 (100.0) |  |
  Yes | 4 (0.2) | 2 (0.2) | 2 (0.4) |  | 0 (0.0) |  |