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Table 4 Associations between pregnancy exposure to air pollutions and preterm birth/low birth weight

From: The association between air pollution and preterm birth and low birth weight in Guangdong, China

  Preterm birth Low birth weight
First trimester Second trimester Third trimester Whole pregnancy First trimester Second trimester Third trimester Whole pregnancy
PM2.5
OR 1.043a 1.056 1.038a 1.007a 1.063 1.061 0.925 1.028a
95% CI 1.01~1.09 0.98~1.14 1.01~1.12 1.01~1.08 0.98~1.15 0.99~1.13 0.86~0.99 1.00~1.06
PM10
OR 1.039a 1.031 1.024a 1.038a 0.967a 1.046 0.937a 1.018a
95% CI 1.01~1.14 .96~1.10 1.02~1.09 1.01~1.07 0.91~1.03 0.99~1.11 0.88~0.99 1.01~1.04
SO2
OR 0.990 1.112 1.081a 1.047 0.907 0.927a 1.019 1.007
95% CI 0.82~1.19 0.89~1.38 1.01~1.29 0.95~1.15 0.77~1.07 0.89~0.96 0.98~1.05 0.99~1.02
NO2
OR 1.130 1.078 0.970 1.051 0.916 1.124a 0.896 1.039
95% CI 0.98~1.30 0.96~1.21 0.88~1.06 0.99~1.11 0.84~1.00 1.02~1.24 0.83~1.10 0.99~1.09
CO
OR 1.059 0.839a 0.991 1.276 1.063a 0.845a 0.974 1.340a
95% CI 0.98~1.14 0.76~0.92 0.92~1.06 0.97~1.68 1.00~1.14 0.77~0.92 0.91~1.04 1.04~1.73
O3
OR 0.891 0.932 1.016a 1.000 0.895 0.979 1.023 0.999
95% CI 0.76~1.04 0.89~1.06 1.004~1.35 0.99~1.01 0.778~1.03 0.87~1.10 0.889~1.18 0.99~1.00
  1. Note: a p<0.05