Table 2.

Sample Characteristics for Measure of Fertility

Traits	Sample Size	Mean (SD)
Age at menarche	259,247	–a
Age at menopause	69,360	–a
FSH levels	17,997	17.7 (24.9)b
Has children	41,946	0.94c
Number of children	41,946	2.9 (1.6)
Age at first child	41,946	23.0 (4.7)
Age at last child	41,946	32.1 (5.5)
Average birth interval	41,946	4.7 (2.5)
Polycystic ovary syndrome	5,184 cases / 82,759 controls	–a

^aSample mean is not available because this is a large meta-analysis of summary statistics.

^bUnit is IU/L (median 6.8).

^cFraction with children.