TABLE II.

Association Between Serum Zinc and Prostate Cancer Risk^a

	Serum zinc (μg/dl)				P for trendb
	≤82.9	82.9–≤92.2	92.2–≤102.5	>102.5
No. of cases	97	95	97	103
No. of controls	196	199	198	190
OR (95% CI)c	1.00	0.98 (0.69–1.40)	0.99 (0.69–1.43)	1.13 (0.79–1.62)	0.38
OR (95% CI)d	1.00	0.99 (0.69–1.42)	0.99 (0.68–1.43)	1.08 (0.74–1.56)	0.65

^aMatching criteria were accounted for by conditional logistic regression: geographic location (Hawaii or California), race/ethnicity, birth year (±1 year), date of blood draw (±6 months), time of blood draw (± 2 hours), and fasting hours prior to blood draw (0–<6, 6–<8, 8–<10, and 10+ hours).

^bBased on a log-transformed continuous variable.

^cAdjusted for age at blood draw and fasting hours prior to blood draw as continuous variables.

^dAdditionally adjusted for family history of prostate cancer, BMI, and education.