“…Although previous study suggested that children's PA levels are mainly in uenced by genetic factors 11 , evidences also point out the in uence of family 12,13 , and personal factors on PA levels 14,15,16,17,18 . In this setting, sex and age were determinants of personal factors 19 and, therefore, male preschoolers, older 19 and exposed to the outdoors 20 had higher levels of PA.…”