Can cell proliferation of umbilical cord blood cells reflect environmental exposures?

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Table 3 An effect of environmental factors on the cell proliferation, based on log-normal multivariate model

Environmental factor	Ratio^a [95% confidence interval (CI)]	p value
Complaint on noise (n = 18) vs. subjects not complaining on this factor (n = 268)	0.82 (0.65; 1.03)	0.094
Living in a direction of a prevalent wind from local IP (n = 70) vs others (n = 216)	1.18 (1.03; 1.35)	0.015
Delivery in fall-winter^b (n = 201) vs. deliveries in spring-summer (n = 85)	1.16 (1.02; 1.31)	0.024

^aRatios represent the multiplicative difference in cell proliferation ratio from the reference category.
^bFall and winter period was defined as months from September through February.