Table 1.

Characteristics of the study sample for sex steroid hormone levels and covariates are presented for EPIC, NHS, and MEC as number (and proportion, percent) of subjects with measured hormones as well as corresponding means and sd

n.a., Not applicable because of low sample size.

^a RIA, Radioimmunoassay.

^b Values taken for EPIC from Refs. 1 and 6, for NHS from Ref. 2, and for MEC from Ref. 4.