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. Author manuscript; available in PMC: 2019 Sep 25.

Published in final edited form as: Environ Res Lett. 2015 Jul 8;10(7):074005. doi: 10.1088/1748-9326/10/7/074005

Table 2.

Correlation Coefficients Between Maternal Exposures During Different Exposure Windows^a.

		1^st trimester	2^nd trimester	Entire pregnancy
PM₁₀	Week 3–8	0.94	0.06	0.22
	1^st trimester		0.15	0.30
	2^nd trimester			0.79
NO₂	Week 3–8	0.93	−0.05	0.44
	1^st trimester		0.07	0.53
	2^nd trimester			0.67
SO₂	Week 3–8	0.97	−0.11	−0.05
	1^st trimester		0.02	0.05
	2^nd trimester			0.79

^a

The exposures were estimated for women living within 50km of a monitor (n=8,729) using 2 monitors covering the entire period of study.