Table 1.

Criteria for defining level of physical activity for the previous 30 days

Physical activity index	Five-level physical activity criteria	Two-level physical activity criteria
0	No regular activity	0	Inactive
1	Other: Participated in some other regular physical activity such as bicycling, swimming, racquet sports, and other strenuous sports, but not walking or jogging
2	Low: Walked or jogged <10 miles per week
3	Moderate: Walked or jogged 10–20 miles per week	1	Active
4	High: Walked or jogged >20 miles per week