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Table 1 The demographic feature of pregnant women with first-hand smoke (FHS) and second hand smoke (SHS) exposure in a rural area of Shanghai in 2018, China (n = 8586)

From: Low birthweight of children is positively associated with mother’s prenatal tobacco smoke exposure in Shanghai: a cross-sectional study

Variables Pregnant women (8586) FHS exposure (81) SHS exposure (1785)
n Proportion (%) n Prevalence (%) n Prevalence (%)
Age (years)†‡
 19–25 237 2.76 6 2.53 62 26.16
 26–30 2870 33.43 25 0.87 728 25.37
 31–35 3858 44.93 29 0.75 730 18.92
 36–48 1621 18.88 21 1.30 265 16.35
BMI before the pregnancy
 Less than 18.50 1819 21.19 18 0.99 390 21.44
 18.50–23.99 5278 61.47 50 0.95 1054 19.97
 24.00–27.00 526 6.13 4 0.76 103 19.58
 Over 27.00 963 11.22 9 0.93 238 24.71
Education†‡
 Illiterate/Primary 71 0.83 1 1.41 14 19.72
 Junior High 795 9.26 14 1.76 181 22.77
 Senior High 1613 18.79 25 1.55 373 23.12
 College and above 6107 71.13 41 0.67 1217 19.93
Family yearly income (CNY)
 Less than 50, 000 1344 15.65 15 1.12 334 24.85
 50, 000–100, 000 1206 14.05 9 0.75 273 22.64
 100, 001–150, 000 1117 13.01 12 1.07 239 21.40
 150, 001–300, 000 1169 13.62 11 0.94 204 17.45
 Over 300, 000 3750 43.68 34 0.91 735 19.60
Residency status†‡
 Local resident 4545 52.94 56 1.23 1094 24.07
 Non-local resident 4041 47.06 25 0.62 691 17.10
Gestational diabetes mellitus (GDM)†‡
 Yes 533 6.21 10 1.88 144 27.02
 No 8053 93.79 71 0.88 1641 20.38
  1. the differences between group on prevalence of prenatal first-hand smoke exposure was statistically significant (P < 0.01)
  2. the differences between group on prevalence of prenatal second-hand smoke exposure was statistically significant (P < 0.01)