Table 5.

Adjusted^* Odds Ratios for chronotype and endometrial cancer risk among post-menopausal women in the California Teachers Study, stratified by chronotype stability.

	Stable chronotype**			Not stable chronotype**
Chronotype at Questionnaire 5 (post-menopause)	Number of Cases	Number of Controls	OR (05% CI)	Number of Cases	Number of Controls	OR (05% CI)
Morning type (referent)	107	7,320	1.00	38	2,810	1.00
More morning than evening	43	2,632	1.10 (0.77, 1.58)	36	2,570	1.08 (0.68, 1.72)
Neither	27	1,420	1.18 (0.77, 1.81)	27	2,048	0.88 (0.53, 1.45)
More evening than morning	36	2,488	1.05 (0.71, 1.54)	30	1,315	1.31 (0.80, 2.16)
Evening type	61	2,490	1.50 (1.09, 2.07)	18	678	1.37 (0.77, 2.46)

^*Multivariable models included age at baseline, race/ethnicity, BMI at baseline, height, family history of endometrial cancer, family history of breast cancer, history of oral contraceptive (OC) use, history of live births combined with breast feeding, and NSAID use.

^**Stable chronotype was defined as having the same chronotype reported on questionnaire 5 (post-menopause) as in teens and college years.