Table IV.

Unadjusted and adjusted odds ratios and 95% CIs for the association between blood metal levels and cycle length, BioCycle Study, 2005–2007.

	Unadjusted		Adjusted
	OR	95% CI	OR	95% CI
Short versus normal cyclea,b
Cadmium	1.7	0.4, 7.1	1.4	0.3, 7.0
Lead	0.9	0.4, 2.0	0.9	0.4, 2.3
Mercury	0.7	0.4, 1.1	0.7	0.4, 1.2
Long versus normal cyclea,b
Cadmium	1.9	0.5, 6.9	4.2	0.6, 28.3
Lead	0.6	0.2, 1.9	0.5	0.1, 1.9
Mercury	1.2	0.9, 1.7	1.2	0.9, 1.7

CI, confidence interval; OR, odds ratio.

^aModels adjusted for cadmium, lead, mercury, age (18–24, 25–29, 30–34, 35–39, 40–44 years) and race/ethnicity (non-Hispanic white, non-Hispanic black, other) using logistic regression.

^bShort cycle (<25 days; n= 22), normal cycle (25–35 days; n= 208) and long cycle (>35 days; n = 17).