Table 3a.
Risk of breast cancer associated with chronotype: results from logistic regression analysis among 39686 California Teacher Study participants
| Chronotype | # cases | Crude Odds Ratio a | 95% CI | Multivariate Adjusted Odds Ratiob | 95% CI |
|---|---|---|---|---|---|
| Definite morning | 955 | 1.00 | – | 1.00 | – |
| More morning than evening | 563 | 1.10 | 0.99 – 1.23 | 1.09 | 0.98 – 1.22 |
| Neither morning/evening | 385 | 1.13 | 1.00 – 1.28 | 1.11 | 0.98 – 1.25 |
| More evening than morning | 424 | 1.14 | 1.01 – 1.29 | 1.11 | 0.99 – 1.26 |
| Definite evening type | 392 | 1.24 | 1.10 – 1.40 | 1.20 | 1.06 – 1.35 |
a
Adjusted for age
b
Adjusted for age, race, family history of breast cancer, age at menarche, smoking pack-years, BMI, alcohol consumption, physical activity, age at first full-term pregnancy, breast feeding history, age at menopause, ever use of hormone therapy.