Table 1.

Clinical characteristics in AA, EA, and nonathletes

	AA (n = 21)	EA (n = 18)	Nonathletes (n = 20)	P Value
Age, yr	20.0 ± 0.4	18.7 ± 0.4	19.1 ± 0.4	NS
Bone age, yr	17.7 ± 0.2	17.5 ± 0.2	17.6 ± 0.2	NS
Age of menarche, yr	13.9 ± 0.5	13.1 ± 0.3	12.2 ± 0.4	0.02*
Height, cm	165.9 ± 1.5	167.5 ± 2.0	164.1 ± 1.3	NS
Weight, kg	57.5 ± 1.6	63.8 ± 2.7	58.3 ± 1.7	NS
BMI, kg/m2	20.9 ± 0.4	22.6 ± 0.6	21.7 ± 0.6	NS
Fat, kg	12.5 ± 0.7	15.7 ± 1.1	15.7 ± 1.2	0.02*†
%Body fat	21.0 ± 1.0	23.5 ± 1.0	26.3 ± 1.2	0.003*
Estradiol, pg/ml	22.2 ± 3.2	27.3 ± 5.8	32.0 ± 6.5	NS

Values are means ± SE.

AA, amenorrheic athletes; EA, eumenorrheic athletes; NAC, nonathletic controls; NS, not significant; BMI, body mass index.

^*P < 0.05, AA vs. nonathletes;

^†P < 0.05, AA vs. EA.