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Table 1 Sociodemographic, medical and prenatal characteristics, and smoking status of pregnant women in Botucatu, Brazil

From: Smoking during pregnancy and harm reduction in birth weight: a cross-sectional study

Variable Preterm delivery (n = 189) Term delivery (n = 1124)
N % N %
Age (years)
  ≤ 19 37 19.6 183 16.3
 20–34 130 68.8 811 72.2
  ≥ 35 22 11.6 130 11.6
Education (years)
  ≤ 8 54 28.6 343 30.5
 9–11 118 62.4 633 56.3
  ≥ 12 16 8.5 147 13.1
 No information 1 0.5 1 0.1
Employed
 Yes 94 49.7 635 56.5
 No 93 49.2 489 43.5
 No information 2 1.1 0 0.0
Live with a partner
 Yes 157 84.0 949 84.4
 No 30 15.9 168 15.0
 No information 2 1.1 7 0.6
First pregnancy
 Yes 81 42.9 427 38.0
 No 108 57.1 697 62.0
Interval between deliveries (years)a
  ≤ 2 28 25.9 145 20.8
 3–5 34 31.5 254 36.5
  ≥ 6 38 35.2 272 39.0
 No information 8 7.4 26 3.7
Pregestational obesity or overweight
 Yes 68 36.0 353 31.4
 No 121 64.0 771 68.6
Prenatal care in public service
 Yes 142 75.1 791 70.4
 No 44 23.3 333 29.6
 No information 3 1.6 0 0.0
Number of prenatal medical visits
  ≤ 7 86 45.5 136 12.1
 8 to 14 81 42.9 923 82.1
  ≥ 15 4 2.1 18 1.6
 No information 18 9.5 47 4.2
Alcohol consumption
 Yes 9 4.8 46 4.1
 No 179 94.7 1076 95.7
 No information 1 0.5 2 0.2
Illegal drug use
 Yes 5 2.6 9 0.8
 No 184 97.4 1115 99.2
Participation in prenatal group
 Yes 51 27.0 240 21.4
 No 126 66.7 831 73.9
 No information 12 6.3 53 4.7
Advised regarding warning signs
 Yes 112 59.3 724 64.4
 No 74 39.1 393 35.0
 No information 3 1.6 7 0.6
Use of folic acid and iron sulfate
 Yes 104 55.0 681 60.6
 No 55 29.1 443 39.4
 No information 30 15.9 0 0.0
Emotional problems
 Yes 31 16.4 179 15.9
 No 158 83.6 940 83.6
 No information 0 0.0 5 0.5
Anemia
 Yes 5 2.6 55 4.9
 No 184 97.4 1069 95.1
High blood pressure/pre-eclampsia/eclampsia/ HELLP syndromeb
 Yes 33 17.5 58 5.2
 No 156 82.5 1066 94.8
Diabetes
 Yes 9 4.8 42 3.7
 No 180 95.2 1082 96.3
Hyperemesis
 Yes 7 3.7 30 2.7
 No 182 96.3 1094 97.3
Hemorrhage/bleeding/ threatened abortion
 Yes 19 10.1 49 4.4
 No 170 89.9 1075 95.6
Infection
 Yes 34 18.0 222 19.8
 No 155 82.0 902 80.2
Smoking in pregnancy
 No 155 82.0 982 87.4
 Yes, 1 to 5 cigarettes per day 8 4.2 41 3.6
 Yes, 6 to 10 cigarettes per day 10 5.3 56 5.0
 Yes, 11 to 40 cigarettes per day 14 7.4 30 2.7
 No information 2 1.1 15 1.3
Birth weight, median (1st and 3rd quartile) (g) 2410 (1845–2810) 3250 (2975–3565)
  1. aTotal of 108 women with preterm delivery and 697 women with term delivery
  2. bHELLP hemolysis, elevated liver enzymes, low platelet count