The questionnaire included items about the frequency of recent average consumption of 4 beverages (green tea, oolong tea, black tea, and coffee) and 36 items about food, as well as items regarding the consumption of alcohol and tobacco, personal and family history of disease, job status, level of education, body weight, height, engaging in sports or exercise, and time spent walking per day. The FFQ did not cover a specific period of time but asked about “everyday diet.” The frequency of green tea consumption was divided into 5 categories: never, occasional, 1 to 2 cups/d, 3 to 4 cups/d, and 5 or more cups/d. Within the study region, the volume of a typical cup of green tea is 100 mL