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Table 3 Correlation between the load carried and the number of different disciplines per day

From: Schoolbag weight carriage in Portuguese children and adolescents: a cross-sectional study comparing possible influencing factors

  Backpack Total load
load (kg) load·BW−1 load (kg) load·BW−1
Correlation coefficient
 5th grade
  Number of disciplines 0.396 0.281 0.478 0.358
  p < 0.001 < 0.001 < 0.001 < 0.001
  N theoretical disciplines 0.523 0.416 0.439 0.352
  p < 0.001 < 0.001 < 0.001 < 0.001
 9th grade
  Number of disciplines 0.196 0.204 0.266 0.290
  p < 0.001 < 0.001 < 0.001 < 0.001
  N theoretical disciplines 0.391 0.348 0.347 0.366
  p < 0.001 < 0.001 < 0.001 < 0.001