Table 1.

Origin of Premutation in Women of Age ⩾40 Years at the Time of the Interview

	No. of Premutationsof Origin
Classification	PIP	MIP	Total
Age at Menopause:
<40 years	2	5	7
⩾40 years	6	10	16
Proved ovarian functiona	4	3	7
Total	12	18	30

^aNot menopausal, with follicular-phase FSH level <40 U/liter.