Clustering of children's activity behaviour: the use of self-report versus direct measures

by Tremblay Mark S, Prince Stephanie A, Saunders Travis J
Published 2011-05-01

A comparison of direct versus self-report measures for assessing physical activity in adults: a systematic review

by Hardt Jill, Hamel Meghan E, Adamo Kristi B, Prince Stéphanie A, Gorber Sarah, Tremblay Mark
Published 2008-11-01