Table 3.

Multiple log-binomial regression of oocyte maturity on concentrations of metals measured in female ICSI patients, with generalized estimating equations used to generate robust standard errors; the Study of Metals and Assisted Reproductive Technology (SMART).

Predictor Variables			95% CI			95% CI
	n a	RR b	Low	High	RR c	Low	High
Blood mercury (μg/L)	31	1.23 *	0.97	1.55	0.79	0.32	1.91
Urine cadmium (μg/L) d	36	1.19	0.24	6.01	1.05	0.11	10.27
Blood lead (μg/dL)	16	0.54 **	0.31	0.93	0.25	0.03	2.50

^aSample size varies for single metal models due to missing values for metals concentrations;

^bRelative risk (RR) for MII-arrest as a function of concentrations of a single measured metal adjusted for age, cigarette smoking, race/ethnicity and urine creatinine (mg/dL) for cadmium;

^cn = 15, relative risk for MII-arrest as a function of concentrations of all measured metals adjusted for age, cigarette smoking, race/ethnicity and urine creatinine (mg/dL);

^*P ≤ 0.10;

^**P ≤ 0.05.

CI, confidence interval; ICSI, intracytoplasmic sperm injection.