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Table 5 Approximate percent change in PAL, MVPA and activity variables for every year increase in age.

From: The Multimedia activity recall for children and adolescents (MARCA): development and evaluation

Variable Mean rates of change (approximate % change per year)
PAL -2.5%***
MVPA -4.8%**
screen +10.2%**
inactive socialising +8.1%*
loco-play -8.2%**
sport -7.7%**
  1. Note: n = 1429; those variables exhibiting significant linear relationships with age are noted with asterisks, *p < 0.05; **p < 0.01; ***p < 0.001; PAL = physical activity level (a weighted mean MET.d-1 score); MVPA = moderate to vigorous physical activity; age range = 9.1–15.3 y; screen time = time spent watching television, playing video games and using computers.