Materials and Methods
Study Population. The CTS cohort was established in 1995 – 1996 when 133,479 active and retired female teachers and administrators participating in the Califor-nia State Teachers Retirement System returned a 16-page, mailed, optically scannable questionnaire (11). The questionnaire covered a wide variety of issues related to breast cancer risk and women’s health, including recent and past alcohol consumption. For purposes of this analysis, we excluded women (in a hierarchical