“…Nineteen studies did not report the instruments used, and from these, only six studies reported information that the used instruments were validated 10,19,47,63,71,76,78,86 . The most used instruments were: the International Physical Activity Questionnaire (IPAQ , 12 studies) 22,36,88,99,102,55,59,60,64,65,76,77,82 , the Global School-Health Survey instrument (GSHS, 8 studies) 11,21,[66][67][68]79,84,96,24,25,29,32,37,41,42,56 , and the Physical Activity Questionnaire for Older Children and Adolescents (PAQ-C and PAQ-A, 10 studies) 12,13,97,101,[16][17][18]31,39,58,72,…”