TABLE 1.

Characteristics of adolescent study participants

Subject race and ethnicity	No. (%)			Mean age at enrollment (yr)	Mean duration of study participation (yr)
	Total	Who achieved menarche during study	Who had a participating mother
All subjects	31 (100)	21 (67.7)	24 (77.4)	10.9	1.6
Black, non-Hispanic	21 (67.7)	14 (66.7)	17 (81.0)	10.9	1.7
White, non-Hispanic	7 (22.6)	5 (71.4)	4 (57.1)	10.8	1.4
White, Hispanic	1 (3.2)	0 (0.0)	1 (100)	10.2	1.4
Native American, non-Hispanic	2 (6.5)	2 (100)	2 (100)	11.5	1.3