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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

  Births PTB Term births Term LBW
  n = 16,615 n (%)† n = 14,836 n (%)†
Parental variables     
Proximity to major roads     
  ≤200 m 953 149 (15.6) 804 80 (10.0)
  >200 m 15662 1630 (10.4) 14032 1145 (8.2)
Maternal age     
  <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     
  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     
  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     
  Non-drinker 15674 1672 (10.7) 14002 1159 (8.3)
  Drinker 757 82 (10.8) 675 53 (7.9)
Paternal smoking     
  Never smoked 8650 874 (10.1) 7776 620 (8.0)
  Ex or current-smoker 7152 774 (10.8) 6378 545 (8.5)
Maternal obesity     
  Not obese 15215 1574 (10.3) 13641 1149 (8.4)
  Obese 1348 183 (13.6) 1165 72 (6.2)
Maternal diabetes     
  No diabetes 15983 1704 (10.7) 14279 1180 (8.3)
  Diabetes 617 72 (11.7) 545 44 (8.1)
Maternal hypertension     
  No hypertension 15707 1672 (10.6) 14035 1149 (8.2)
  Hypertension 893 104 (11.6) 789 74 (9.4)
Newborn variables     
Sex     
  Male 8571 1006 (11.7) 7565 490 (6.5)
  Female 8001 770 (9.6) 7231 730 (10.1)
Parity     
  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     
  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     
Proportion of professional workers     
  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     
  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)
  1. †Proportions of PTBs were calculated by dividing the number of PTBs by total births in the corresponding category. Proportions of LBW births were calculated by dividing the number of term LBW by total term births in the corresponding category.
  2. PTB; preterm birth, LBW; low birth weight.