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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