Skip to main content

Table 2 Pearson correlation coefficients between pairs of period-average concentrations of five air pollutants in 18,835 pregnant women residing in Seoul for 2002–2013 from the Korean National Health Insurance Service–National Sample Cohort

From: Exposure to air pollution during preconceptional and prenatal periods and risk of hypertensive disorders of pregnancy: a retrospective cohort study in Seoul, Korea

Exposure period

12 months

6 months

3 months

PM10

 6 months

0.74

–

–

 3 months

0.61

0.8

–

 1 month

0.5

0.53

0.8

NO2

 6 months

0.77

–

–

 3 months

0.62

0.82

–

 1 month

0.51

0.56

0.82

CO

 6 months

0.69

–

–

 3 months

0.53

0.81

–

 1 month

0.43

0.51

0.85

SO2

 6 months

0.74

–

–

 3 months

0.58

0.83

–

 1 month

0.49

0.56

0.85

O3

 6 months

0.57

–

–

 3 months

0.43

0.77

–

 1 month

0.35

0.43

0.84

  1. PM10 particulate matter, NO2 nitrogen dioxide, CO carbon monoxide, SO2 sulfur dioxide, O3 ozone