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Table 6 Associations between low birth weight 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

1.059a

1.046

0.982

0.998

1.004

0.899

0.951

0.947

0.990

1.082a

95% CI

1.02~1.10

0.98~1.11

0.91~1.06

0.99~1.01

0.99~1.02

0.84~0.96

0.89~1.01

0.89~1.01

0.96~1.01

1.01~1.17

PM10

OR

1.090a

1.035

0.988

0.989

1.002

0.921

0.964

0.965

1.063a

1.063a

95% CI

1.03~1.15

0.98~1.08

0.98~1.00

0.98~1.00

0.99~1.01

0.87~1.00

0.92~1.01

0.92~1.01

1.00~1.13

1.01~1.13

SO2

OR

1.328a

0.957

0.980

1.026

0.968

0.951a

0.981

0.992

1.124

1.124

95% CI

1.01~1.75

0.92~1.07

0.95~1.02

0.98~1.07

0.93~1.01

0.91~0.99

0.94~1.02

0.81~1.21

0.88~1.44

0.88~1.43

NO2

OR

1.185a

1.137a

1.036

0.999

0.978

0.995

0.968a

0.918

1.010

1.030a

95% CI

1.06~1.32

1.02~1.27

0.91~1.17

0.87~1.15

0.95~1.01

0.97~1.02

0.94~0.99

0.83~1.02

0.99~1.03

1.01~1.15

CO

OR

1.117a

1.038

0.978

0.930a

0.862a

0.886a

0.924a

0.942a

0.960

1.018

95% CI

1.05~1.19

0.97~1.11

0.92~1.04

0.87~0.99

0.79~0.94

0.83~0.95

0.87~0.98

0.89~0.99

0.90~1.02

0.95~1.09

O3

OR

1.108a

0.999

0.999

0.885

0.984

0.993

1.084a

1.000

0.907

1.106a

95% CI

1.03~1.19

0.98~1.00

0.99~1.00

0.82~0.96

0.92~1.05

0.94~1.05

1.02~1.15

0.93~1.07

0.84~1.00

1.03~1.12

  1. Note: a p<0.05