Table 1.

Baseline characteristics of the analytic cohort, California Teachers Study, 1995.

	Not using HT (n=65,341)				Current HT use (n=19,926)
	N	%	median	IQR	N	%	median	IQR
Age (years)			45	37–53			56	52–63
Age at menarche (years)			13	12–13			13	12–13
missing	658	1.0%			482	2.4%
Gravid	49,031	75.0%			16,092	80.8%
missing	1,008	1.5%			530	2.7%
Age at last pregnancy (among gravid)a			31	28–35			30	27–34
missing	182	0.4%			1	0.0%
Duration of oral contraceptive use (years)
none	17,499	26.8%			5,724	28.7%
<3	12,605	19.3%			3.173	15.9%
≥3	32,384	49.6%			9,636	48.4%
missing	2,853	4.4%			1,393	7.0%
Menopausal status
premenopausal	46,097	70.5%			0
postmenopausal	19,244	29.5%			19,926	100%
Ever use of HT
never	58,555	89.6%			0
former	6,786	10.4%			0
current	0				19,926	100%
History of hypertension	9,030	13.8%			4,534	22.8%
missing	0				0
History of diabetes	1,517	2.3%			441	2.2%
missing	0				0
Average daily caloric intake (kcal)			1,564	1,233–1,951			1,472	1,178–1,822
missing	5,723	8.8%			1,507	7.6%

Abbreviations: HT: hormone therapy; IQR: interquartile range; N: number.

^aAge at most recent pregnancy among premenopausal women.