Table 2.

Association between drinking patterns in the year before baseline and subsequent invasive breast cancer risk among postmenopausal women in the CTS

Drinking patternaCasesbPerson-yearsRRc95% CI
Nondrinkers31165,9751.0
“Sporadic”d28261,5170.990.84–1.17
“Daily” <20 g/day11622,3061.070.86–1.32
“Daily” ≥20 g/day11016,9521.341.07–1.67
  • a “Sporadic” drinker defined as consuming alcohol on 4 or less days per week; “daily” drinker defined as consuming alcohol on 5 or more days per week.

  • b Case counts and total person-years reflect women with complete data on all covariates of interest.

  • c Adjusted for age, race/ethnicity, caloric intake, family history of breast cancer, age at menarche, nulliparity/age at FFTP, physical activity, BMI, and duration of ERT use.

  • d Only two cases consumed ≥20 g/day of alcohol.