date:Apr 26, 2012
equency and portion size of caffeinated and decaffeinated coffee consumption. Ten frequency categories were available (from never to 5 times/d or more), and portion size ranged from 0.5 cups to 3 cups (1 cup was equal to 150 mL). Follow-up questionnaires were given every 2-3 y after baseline to determine the incidence of chronic diseases.
The study population was divided into five coffee consumption categories (1 cup/day, 1 to 2 cups/day, 2 to 3 cups/day, 3 to 4 cups/day, and 4 cups/day). The d