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Table 2 Pearson’s correlations of different source PM10 between each of the four different pregnancy time periods (N = 12,020)

From: Trimester effects of source-specific PM10 on birth weight outcomes in the Avon Longitudinal Study of Parents and Children (ALSPAC)

a) Correlation of PM10_road in T1, T2, T3 and WP

b) Correlation of PM10_other in T1, T2, T3 and WP

c) Correlation of PM10_total in T1, T2, T3 and WP

PM10_road

T1

T2

T3

WP

PM10_other

T1

T2

T3

WP

PM10_total

T1

T2

T3

WP

T1

1

   

T1

1

   

T1

1

   

T2

0.94

1

  

T2

0.86

1

  

T2

−0.03

1

  

T3

0.91

0.92

1

 

T3

0.84

0.85

1

 

T3

−0.08

0.03

1

 

WP

0.97

0.98

0.97

1

WP

0.95

0.95

0.94

1

WP

0.53

0.61

0.54

1

  1. T1: first trimester; T2: second trimester; T3: third trimester; WP entire pregnancy period