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Background: It is unclear whether it is possible to accurately estimate physical activity energy expenditure (PAEE) by self-report in youth.

Objective: We assessed the validity and reliability of 4 self-reports to assess PAEE and time spent at moderate and vigorous intensity physical activity (MVPA) over the previous week in British young people between 4 and 17 y of age.

Design: PAEE and MVPA were derived from the Children’s Physical Activity Questionnaire, Youth Physical Activity Questionnaire, and Swedish Adolescent Physical Activity Questionnaire; a lifestyle score indicative of habitual activity was derived from the Child Heart and Health Study in England Questionnaire. These data were compared with criterion methods, PAEE, and MVPA derived from simultaneous measurements by doubly labeled water and accelerometry in 3 age groups: 4–5 y (n = 27), 12–13 y (n = 25), and 16–17 y (n = 24). Validity was …