Characteristics of colorectal cancer cases and controls in the nested case-control study within the Nurses’ Health Study.

aBody mass index is weight in kilograms divided by the square of the height in meters.bMET denotes metabolic equivalent. Met –hours = sum of the average time/wk in each activity x MET value of each activity. One MET, the energy spent sitting quietly, is equal to 3.5 ml of oxygen uptake per kilograms of body weight per minute for a 70-kg adult.cNutrient values (calcium, vitamin D, and folate) represent the mean of energy-adjusted intakes.