Estimating the prevalence of leisure-time physical activity.
Goodman
R A
RA
Baker
D B
DB
Powell
K E
KE
Sayre
J W
JW
D000293:Adolescent; D000328:Adult; D000368:Aged; D004734:Energy Metabolism; D015444:Exercise; D006801:Humans; D007899:Leisure Activities; D008875:Middle Aged; D013997:Time Factors