Table 1.

Sample characteristics from 50 pre- and perimenopausal women at six points across time—MBHMS.

	1993/4	1994/5	1995/6	1997/98	1998/99	1999/2000
	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD
Age	41.5 ± 2.67	42.5 ± 2.67	43.4 ± 2.61	46.3 ± 2.60	47.3 ± 2.67	48.3 ± 2.56
AMH (ng/ml)
Observed values*	.66 ± .50	.51 ± .36	.39 ± .30	.16 ± .11	.19 ± .11	.15 ± .10
% ↓ detection	3 (6%)	5 (10%)	8 (16%)	26 (52%)	27 (54%)	32 (64%
Inhibin B (pg/ml)
Observed values*	72 ± 44	56 ± 43.5	59 ± 35	38 ± 21	47 ± 72	34 ± 30
% ↓ detection	2 (4%)	2 (4%)	9 (18%)	18 (36%)	23 (46%)	23 (46%)
FSH (mIU/ml)	8.0 ± 2.4	7.6 ± 3.7	7.7 ± 4.9	16.4 ± 15.7	18.3 ± 15.2	21.5 ±18.3
HOMA-IR	N/A**	1.68 ± 1.05	1.84 ± 1.74	2.48 ± 2.36	2.35 ± 2.10	2.60 ± 2.97
BMI (kg/m2)	27.0 ± 5.9	27.6 ± 6.1	27.6 ± 5.9	28.3 ± 6.5	28.5 ± 6.3	28.8 ± 6.4

^*data are for AMH and inhibin B that are observed above level of assay detection

^**HOMA-IR data are not available from this annual visit.