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Table 1 Descriptive statistics of pregnant women, PMs and traffic indicators

From: Preconception air pollution exposure and glucose tolerance in healthy pregnant women in a middle-income country

Variables In study year
Pregnant Women characteristics
 Age (year); median (IQR) 28 (8)
 Pre-pregnancy BMI (kg/m2); median (IQR) 21.2 (5.9)
 Gestational age (week); median (IQR) 26 (4)
 Self-reported tobacco exposure at home
  Yes; N (%) 75 (30)
  No; N (%) 175 (70)
 Abortion history
  Yes; N (%) 90 (25)
  No; N (%) 160 (75)
 Family history of diabetes
  Yes; N (%) 24 (11)
  No; N (%) 189 (89)
 Parity (N); median (IQR) 2 (2)
 Illiterate adults per census tract (%); median (IQR) 22.2 (15.3)
 Unemployed adults per census tract(%); median (IQR) 7.0 (4.5)
Glucose concentrations (mg/dL); median (IQR)
 FBG 69 (8)
 1-h post-load glucose 112 (35)
 2-h post-load glucose 100 (26)
Particulate matter pollutants (μg/m3); median (IQR)
 PM1 40.8 (14.7)
 PM2.5 47.4 (21.5)
 PM10 52.9 (23.7)
Traffic indicators (m); median (IQR)
 Total street length in a 100 m buffer 905 (257)
 Total street length in a 300 m buffer 7756 (2035)
 Total street length in a 500 m buffer 20,704 (6292)
 Proximity to major roads 321 (388)
  1. IQR interquartile range, BMI body mass index, FGB fasting blood glucose