Validity and Comprehensibility of Physical Activity Scales for Children With Sport Injuries.

Background: Adult physical activity scales are used with children but may not be valid in this population. This study assesses the appropriateness and comprehensibility of currently used physical activity scales in children, identifies sources of response errors, and suggests scale modifications.

Methods: Cognitive interviews were conducted with 30 children who had a lower extremity injury, purposefully sampled based on age and sex.