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Table 2 Exposure characteristics ( n= 240)

From: Placental DNA hypomethylation in association with particulate air pollution in early life

PM 2.5, μg/m 3 Mean SD 25 thpercentile 75 thpercentile
Pre-implantation (1-5d) 16.9 11.0 10.4 19.3
Implantation (6-12d) 16.9 9.8 10.1 20.1
Implantation range (6-21d) 16.7 8.1 11.3 20.4
Post-implantation (22-28d) 17.3 10.4 10.1 20.4
Trimester 1 (1-13w) 16.7 5.9 12.3 20.0
Trimester 2 (14-26w) 17.4 6.2 12.0 22.1
Trimester 3 (27w-delivery) 18.2 6.3 12.8 22.9
Whole pregnancy 17.4 3.6 15.4 19.3