Table 1 Proportions of preterm births and term low birth weight by characteristics of parents, newborns, and census region
From: Residential proximity to major roads and adverse birth outcomes: a hospital-based study
| Â | Births | PTB | Term births | Term LBW |
|---|---|---|---|---|
|  | n = 16,615 | n (%)†| n = 14,836 | n (%)†|
Parental variables | Â | Â | Â | Â |
Proximity to major roads | Â | Â | Â | Â |
  ≤200 m | 953 | 149 (15.6) | 804 | 80 (10.0) |
  >200 m | 15662 | 1630 (10.4) | 14032 | 1145 (8.2) |
Maternal age | Â | Â | Â | Â |
  <20 | 2096 | 236 (11.3) | 1860 | 183 (9.8) |
  20-34 | 11663 | 1216 (10.4) | 10447 | 824 (7.9) |
  ≥35 | 2854 | 327 (11.5) | 2527 | 218 (8.6) |
Household occupation | Â | Â | Â | Â |
  Professional workers | 1854 | 143 (7.7) | 1711 | 121 (7.1) |
  Employees | 13070 | 1408 (10.8) | 11662 | 995 (8.5) |
  Self-employed/Part-time workers/Unemployed | 952 | 106 (11.1) | 846 | 63 (7.4) |
Maternal smoking | Â | Â | Â | Â |
  Never smoked | 15545 | 1607 (10.3) | 13938 | 1129 (8.1) |
  Ex- or current-smoker | 877 | 145 (16.5) | 732 | 82 (11.2) |
Maternal alcohol consumption | Â | Â | Â | Â |
  Non-drinker | 15674 | 1672 (10.7) | 14002 | 1159 (8.3) |
  Drinker | 757 | 82 (10.8) | 675 | 53 (7.9) |
Paternal smoking | Â | Â | Â | Â |
  Never smoked | 8650 | 874 (10.1) | 7776 | 620 (8.0) |
  Ex or current-smoker | 7152 | 774 (10.8) | 6378 | 545 (8.5) |
Maternal obesity | Â | Â | Â | Â |
  Not obese | 15215 | 1574 (10.3) | 13641 | 1149 (8.4) |
  Obese | 1348 | 183 (13.6) | 1165 | 72 (6.2) |
Maternal diabetes | Â | Â | Â | Â |
  No diabetes | 15983 | 1704 (10.7) | 14279 | 1180 (8.3) |
  Diabetes | 617 | 72 (11.7) | 545 | 44 (8.1) |
Maternal hypertension | Â | Â | Â | Â |
  No hypertension | 15707 | 1672 (10.6) | 14035 | 1149 (8.2) |
  Hypertension | 893 | 104 (11.6) | 789 | 74 (9.4) |
Newborn variables | Â | Â | Â | Â |
Sex | Â | Â | Â | Â |
  Male | 8571 | 1006 (11.7) | 7565 | 490 (6.5) |
  Female | 8001 | 770 (9.6) | 7231 | 730 (10.1) |
Parity | Â | Â | Â | Â |
  First birth | 9028 | 928 (10.3) | 8100 | 748 (9.2) |
  Second birth | 5686 | 618 (10.9) | 5068 | 349 (6.9) |
  More than third birth | 1889 | 232 (12.3) | 1657 | 127 (7.7) |
Birth year | Â | Â | Â | Â |
  1997-2001 | 5959 | 568 (9.5) | 5391 | 425 (7.9) |
  2002-2005 | 4630 | 539 (11.6) | 4091 | 356 (8.7) |
  2006-2010 | 6026 | 672 (11.2) | 5354 | 444 (8.3) |
Census regions level variables | Â | Â | Â | Â |
Proportion of professional workers | Â | Â | Â | Â |
  Q1 (13.0-33.8%) (affluent) | 5453 | 514 (9.4) | 4939 | 342 (6.9) |
  Q2 (10.0-13.0%) (middle) | 5524 | 543 (9.8) | 4981 | 441 (8.9) |
  Q3 (0–10.0%) (poor) | 5628 | 720 (12.8) | 4908 | 442 (9.0) |
Proportion of production or transportation workers | Â | Â | Â | Â |
  Q1 (0–37.9%) (affluent) | 5406 | 486 (9.0) | 4920 | 374 (7.6) |
  Q2 (37.9-45.2%) (middle) | 5589 | 575 (10.3) | 5014 | 414 (8.3) |
  Q3 (45.2-86.3%) (poor) | 5610 | 716 (12.8) | 4894 | 437 (8.9) |