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This study examines the convergent validity of the Physical Activity Questionnaire for Children (PAQ-C) for assessing moderate-to-vigorous and total physical activity (PA) in school children. 430 participants (51.6% girls) aged 9–12 years provided valid accelerometer data (wGT3X-BT) and completed the PAQ-C. Convergent validity was assessed using Pearson correlations ( r ) and Bland-Altman plots. The PAQ-C total score was similarly associated with moderate-to-vigorous PA and total PA ( r  = .28 and .26,  p  &lt; .001, respectively). 10- and 11-year-old groups were the only in which the PAQ-C was significantly associated with both accelerometer variables ( p  &lt; .001). Girls showed higher associations ( r  = .31 for each,  p  &lt; .001) than boys ( r  = .18 and .15 for moderate-to-vigorous PA and total PA, respectively,  p  &lt; .05). Acceptable measurement bias for all age groups (range, 3.6–7%) was found. Researchers should be cautious when using the PAQ-C to assess moderate-to-vigorous PA in school children.

Convergent validity of the Physical Activity Questionnaire for Children (PAQ-C): assessing moderate-to-vigorous or total physical activity?