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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