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Table 1 Load carriage at 10, 10 to 15% and more than 20% of the BW by all subjects and only normal BMI subjects [n (%)]

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

  Maximum subject’s load All measurements
Backpack Total load Normal BMI Backpack Total load Normal BMI
Backpack Total load Backpack Total load
5th year
 ≤10% 10 (17%) 5 (9%) 1 (3%) 0 (0%) 78 (29%) 60 (22%) 16 (9%) 11 (6%)
 > 10% & ≤15% 10 (17%) 12 (21%) 4 (11%) 2 (6%) 106 (39%) 103 (38%) 77 (46%) 65 (39%)
 > 15% & ≤20% 29 (50%) 20 (34%) 22 (61%) 16 (44%) 75 (27%) 81 (30%) 63 (37%) 68 (40%)
 > 20% 9 (16%) 21 (36%) 9 (25%) 18 (50%) 13 (5%) 28 (10%) 13 (8%) 25 (15%)
9th year
 ≤10% 32 (55%) 26 (45%) 19 (49%) 14 (36%) 233 (82%) 213 (75%) 149 (78%) 135 (70%)
 > 10% & ≤15% 23 (40%) 23 (40%) 17 (44%) 17 (44%) 48 (17%) 56 (20%) 39 (20%) 42 (22%)
 > 15% & ≤20% 3 (5%) 9 (15%) 3 (8%) 8 (20%) 4 (1%) 16 (5%) 4 (2%) 15 (8%)
 > 20% 0 (0%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 0 (0%) 0 (0%)