Table 2.

Individual associations between body size variables and risk of type I endometrial cancer by HT use, California Teachers Study, 1995–2012.

	Not using HT					Currently using HT
	Cases	Person- years	HRa	95% CI		Cases	Person- years	HRb	95% CI
Height (inches)
<63	59	103,432	1.0		c	131	128,704	1.0
63–66	188	285,585	1.29	0.96–1.73
≥67	106	136,302	1.75	1.26–2.42		67	41,732	1.78	1.32–2.40
missing	1	1,256				0	305
			ptrend=0.0005
BMI at age 18 (kg/m2)
<25	269	454,597	1.0			173	151,357	1.0
≥25	67	54,392	1.77	1.34–2.33		18	13,767	1.06	0.64–1.75
missing	18	17,586				7	5,616
BMI at baseline (kg/m2)
<25	134	325,310	1.0			122	108,264	1.0
25–29	97	119.747	1.51	1.16–1.97		69	58,048	100	0.74–1.35
≥30	110	67,501	2.67	2.04–3.50
missing	13	14,018				7	4,428
			ptrend<0.0001
Weight change (pounds) (age 18 to baseline)
loss ≥10	40	56,578	1.69	1.16–2.44		128	104,603	1.0
stable	95	267,152	1.00
gain ≥25	203	185,307	2.20	1.72–2.83		62	60,519	0.83	0.61–1.13
missing	16	17,538				8	5,618
Waist-to-height ratio
<0.48	65	195, 604	1.0			75	64,317	1.0
≥0.48	204	206,120	1.91	1.43–2.54		91	71,962	0.87	0.64–1.19
missing	85	124,852				32	34,461

Abbreviations: BMI: body mass index; CI: confidence interval; HR: hazard ratio; HT: hormone therapy.

^aAdjusted for the interaction between age at menarche and time-dependent age, gravidity, age at last pregnancy, duration of oral contraceptive use, the interaction between history of hypertension and time-dependent age, history of diabetes, and average daily caloric intake; age was the time metric and the model was stratified by age at baseline.

^bAdjusted for duration of oral contraceptive use, and the interaction between history of hypertension and time-dependent age; age was the time metric and the model was stratified by age at baseline.

^cIndicates cells which were collapsed for analysis.