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Table 5 Associations between preterm birth and pregnancy exposure to air pollutions during each month

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

  The first month The second month The third month The fourth month The fifth month The sixth month The seventh month The eighth month The ninth month The tenth month
PM2.5
OR 1.006 1.038a 1.001 0.991 1.002 0.995 1.010 1.028a 0.992 1.021
95% CI 0.99~1.01 1.01~1.07 0.98~1.02 0.97~1.01 0.98~1.02 0.98~1.01 0.99~1.03 1.01~1.05 0.97~1.01 0.99~1.04
PM10
OR 1.006 1.021a 0.993 0.989 1.000 0.999 1.007 1.012a 0.990 1.008
95% CI 0.98~1.02 1.01~1.04 0.99~1.01 0.97~1.00 0.99~1.01 0.99~1.01 0.99~1.02 1.00~1.02 0.98~1.00 0.99~1.02
SO2
OR 1.052 1.018 .920a 1.002 1.035 0.998 0.987 1.019 0.995 1.033
95% CI 0.99~1.12 0.97~1.07 0.88~0.96 0.95~1.05 0.98~1.09 0.95~1.05 0.94~1.03 0.98~1.06 0.96~1.04 0.99~1.07
NO2
OR 1.032 1.043a 0.962a 1.010 1.013 1.016 0.986 1.021 1.000 1.034a
95% CI 0.99~1.08 1.01~1.08 0.93~0.99 0.97~1.05 0.98~1.06 0.98~1.05 0.95~1.02 0.98~1.06 0.97~1.03 1.00~1.07
CO
OR 1.905a 1.069a 0.970 0.906a 0.887 0.902a 0.924 0.971 0.990 1.001
95% CI 1.02~1.17 1.001~1.14 0.91~1.04 0.84~0.98 0.81~0.97 0.84~0.97 0.87~0.98 0.91~1.03 0.931~1.05 0.93~1.08
O3
OR 1.004 1.000 0.999 0.934 1.006 0.958 1.023 1.103a 0.987 1.007
95% CI 0.93~1.09 0.99~1.00 0.99~1.00 0.86~1.01 0.94~1.08 0.90~1.01 0.96~1.08 1.03~1.18 0.89~1.04 0.99~1.02
  1. Note: a p<0.05