Maternal exposure to polychlorinated biphenyls and the secondary sex ratio: an occupational cohort study

Table 3 Crude and adjusted odds of birth of a male infant among women occupationally PCB-exposed and unexposed prior to estimated date of conception

Estimated Cumulative PCB exposure^a, at estimated date of conception		Exposed Women (n)	Crude OR (95% CI)	Adjusted^b OR (95% CI)
Continuous model (log linear)
	Per 100,000 increase	1,506	1.00 (0.98, 1.03)	1.01 (0.98, 1.03)
Categorical model
	No exposure	1,089	1.00 (ref)	1.00 (ref)
	> 0 to <27,900	377	0.94 (0.75, 1.19)	0.93 (0.73, 1.19)
	27,900 to <108,140	376	1.14 (0.90, 1.44)	1.11 (0.87, 1.41)
	108,140 to <300,216	377	0.90 (0.72, 1.14)	0.90 (0.71, 1.15)
	300,216+	376	1.02 (0.81, 1.29)	1.06 (0.83, 1.36)

^a Cumulative exposure was estimated using the combined inhalation-dermal job exposure matrix
^b Adjusted for the mother's date of birth, and age at birth of her first born

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