We sequentially excluded participants who reported a prior
cancer diagnosis other than non-melanoma skin cancer
(N¼780), without measured uCd (N¼2738) or complete information for other analysis variables (N¼815), or who died of
cancer within 1 year of baseline (N¼18). Follow-up time for
remaining participants (7455 men and 8218 women) was
calculated from the date of NHANES III interview to death, or
31 December 2006