Table 4 Relationship between lifestyle factors and distorted body image (overestimation) among boys (Japan; 2005–2009)
| Â | Body image perception, n (%) | Adjusteda OR (95Â % CI) | P-value | |
|---|---|---|---|---|
| Â | Correct | Overestimated | ||
Exercise | Â | Â | Â | Â |
  Daily | 507 (86.7) | 37 (75.5) | 0.35 (0.16–0.77) | 0.009 |
  Sometimes | 35 (6.0) | 3 (6.1) | 0.41 (0.10–1.65) | 0.210 |
  Never | 43 (7.4) | 9 (18.4) | 1.00 |  |
Snacking after dinner | Â | Â | Â | Â |
  Yes | 314 (52.7) | 22 (44.0) | 0.69 (0.39–1.24) | 0.219 |
  No | 282 (47.3) | 28 (56.0) | 1.00 |  |
Skipping breakfast | Â | Â | Â | Â |
  No | 568 (95.5) | 45 (91.8) | 1.00 |  |
  Yes | 27 (4.5) | 4 (8.2) | 1.87 (0.63–5.59) | 0.262 |
Wakeup time | Â | Â | Â | Â |
  Before 6:30 | 298 (52.6) | 23 (46.9) | 1.00 |  |
  6:30–6:59 | 84 (14.8) | 7 (14.3) | 1.09 (0.45–2.65) | 0.842 |
  After 7:00 | 185 (32.6) | 19 (38.8) | 1.31 (0.69–2.48) | 0.403 |
Bedtime | Â | Â | Â | Â |
  Before 22:00 | 58 (10.6) | 3 (6.8) | 1.00 |  |
  22:00–22:59 | 298 (54.7) | 26 (59.1) | 1.63 (0.48–5.59) | 0.434 |
  After 23:00 | 189 (34.7) | 15 (34.1) | 1.46 (0.41–5.25) | 0.561 |
Hours of sleep | Â | Â | Â | Â |
   < 8 | 110 (20.6) | 7 (15.9) | 1.00 |  |
  8–9 | 302 (56.7) | 28 (63.6) | 1.45 (0.61–3.42) | 0.397 |
  9+ | 121 (22.7) | 9 (20.5) | 1.20 (0.43–3.35) | 0.722 |