Table 1.

Comparison of Study Populations

	Population in Study by
	Hundscheid et al. (2000a)	Murray et al. (2000)a	Vianna-Morgante and Costa (2000)a
No. premutation carriers interviewed (age)	148 (>18 years)	116 (not specified)	113 (⩾25 years)
Median age at examination	50 years	Not specified	38 years
No. pedigrees examined (average no. females/pedigree)	55 (2.69)	62 (1.87)	Not specified
No. PIP/no. MIP/no. unknown [PIP:MIP]	106/42/not specified [2.52]	51/40/25 [1.27]	32/27/54 [1.19]
No. females ⩾40 years at examination (PIP/MIP) [PIP:MIP]	82/27 [3.03]	12/18 [.67]	15/10 [1.50]
Ratio of no. females ⩾40 years at examination:no. females  <40 years at examination (PIP/MIP)	3.41/1.80	.31/.82	.88/.59
Mean age at menopause, for premutation carriersb	45 years	48 years	Not done
% POF among females ⩾40 years (PIP/MIP)	28%/4%	17%/28%	33%/20%

^aIn this issue of the Journal.

^bEstimated using survival analysis.