Personal/demographic correlates
There are consistent positive trends for leisure-time physical activity in adults associated with male gender and higher levels of education and socioeconomic status (SES), but negatively associated with nonwhite ethnicity and age (Trost et al.2002), with similar trends in youth (Sallis, Prochaska and Taylor 2000). Such gender differences are highly reproducible and one of the most consistent findings in the literature. Promoting physical activity in girls