A new study from Cornell University is the first to find that the amount of time elementary-school-aged children spend in gym class may correlate to the likelihood of them becoming obese.

The study, which will be published in the Journal of Health Economics, found that when schools increased the amount of physical education required by 60 minutes per week, the likelihood of a fifth grader being obese was reduced by nearly 5 percent.

The researchers also found that increased PE time reduced the probability of boys becoming obese, but did not seem to have the same effect on girls.