Physical activity included occupational, commuting, and leisure time physical activity. A detailed description of the questions is presented elsewhere,23,24 and the way the questions were constructed was evaluated previously.25 The subjects reported their occupational physical activity as "light" when it was physically very easy (eg, the desk work of a secretary), or as "moderate or active" when it included standing, walking, walking and lifting, or heavy manual labor (eg, the work of a store assistant or of an industrial or farm worker). The subjects were asked whether they walked, rode a bicycle, or used motorized transportation to and from work and about the daily duration of this activity. The daily commuting journey was divided into 2 categories: using motorized transportation or walking and/or bicycling less than 30 minutes, and walking and/or bicycling 30 minutes or longer. Self-reported leisure time physical activity was divided into 2 categories: "low" when subjects were almost completely inactive (eg, they read, watched TV, or engaged in a physical activity not of moderate or high level), and "moderate or high" when they engaged more than 4 hours per week in a physical activity such as walking, bicycling, light gardening, fishing, or hunting (but excluding travel to work), or performed vigorous physical activity more than 3 hours per week such as running, jogging, skiing, swimming, any types of team ball games, heavy gardening, or regular exercise such as competitive sports several times per week. Since our previous study has shown that moderate and high occupational, commuting, or leisure time physical activity independently and significantly reduces risk of type 2 diabetes,11 physical activity categories were merged and regrouped into 3 categories: "low" when subjects reported light levels of occupational, commuting (<30 minutes), and leisure time physical activity; "moderate" when subjects reported only 1 of the 3 types of "moderate to high" physical activity; and "high" when subjects reported 2 or 3 types of "moderate to high" physical activity.