Table 2 Relationship between lifestyle factors and distorted body image (underestimation) among boys (Japan; 2005–2009)
| Â | Body image perception, n (%) | Adjusteda OR (95Â % CI) | P-value | |
|---|---|---|---|---|
| Â | Correct | Underestimated | ||
Exercise | Â | Â | Â | Â |
  Daily | 507 (86.7) | 188 (85.8) | 0.85 (0.46–1.57) | 0.609 |
  Sometimes | 35 (6.0) | 14 (6.4) | 0.84 (0.36–2.00) | 0.699 |
  Never | 43 (7.4) | 17 (7.8) | 1.00 |  |
Snacking after dinner | Â | Â | Â | Â |
  Yes | 314 (52.7) | 121 (54.0) | 1.05 (0.76–1.44) | 0.774 |
  No | 282 (47.3) | 104 (46.0) | 1.00 |  |
Skipping breakfast | Â | Â | Â | Â |
  No | 568 (95.5) | 216 (95.2) | 1.00 |  |
  Yes | 27 (4.5) | 11 (4.8) | 1.10 (0.53–2.29) | 0.795 |
Wakeup time | Â | Â | Â | Â |
  Before 6:30 | 298 (52.6) | 111 (49.6) | 1.00 |  |
  6:30–6:59 | 84 (14.8) | 34 (15.2) | 1.24 (0.77–1.98) | 0.374 |
  After 7:00 | 185 (32.6) | 79 (35.3) | 1.20 (0.84–1.70) | 0.319 |
Bedtime | Â | Â | Â | Â |
  Before 22:00 | 58 (10.6) | 24 (11.0) | 1.00 |  |
  22:00–22:59 | 298 (54.7) | 119 (54.6) | 1.00 (0.59–1.70) | 1.000 |
  After 23:00 | 189 (34.7) | 75 (34.4) | 1.05 (0.60–1.83) | 0.867 |
Hours of sleep | Â | Â | Â | Â |
   < 8 | 110 (20.6) | 44 (20.4) | 1.00 |  |
  8–9 | 302 (56.7) | 120 (55.6) | 0.92 (0.61–1.40) | 0.705 |
  9+ | 121 (22.7) | 52 (24.1) | 0.99 (0.61–1.61) | 0.964 |