Table 1 Characteristics of study participants by sex (Japan; 2005–2009)
Variable | Boys (n = 885) | Girls (n = 846) | P-value |
|---|---|---|---|
Age (years) | 12.3 (0.4) | 12.3 (0.4) | 0.631 |
Height (cm) | 154.4 (8.1) | 152.5 (6.0) | <0.001 |
Weight (kg) | 44.5 (9.7) | 43.6 (7.9) | 0.040 |
Body mass index (kg/m2) | 18.5 (3.0) | 18.7 (2.7) | 0.276 |
Actual weight (%) | Â | Â | Â |
  Underweight | 73 (8.2) | 88 (10.4) | 0.116 |
  Normal weight | 694 (78.4) | 666 (78.7) | |
  Overweight | 118 (13.3) | 92 (10.9) | |
Self-perceived weight status (%) | Â | Â | Â |
  Thin | 268 (30.3) | 139 (16.4) | <0.001 |
  Normal | 484 (54.7) | 506 (59.8) | |
  Heavy | 133 (15.0) | 201 (23.8) | |
Body image perception (%) | Â | Â | Â |
  Underestimated | 230 (26.0) | 99 (11.7) | <0.001 |
  Correct | 605 (68.4) | 591 (69.9) | |
  Overestimated | 50 (5.6) | 156 (18.4) |