Table 2 Comparisons of characteristics between the normal weight and underweight groups in boys (Japan, 2001–2008)
From: Lifestyle factors associated with underweight among Japanese adolescents: a cross-sectional study
Normal weight (n = 933) | Underweight (n = 99) | P valuea | |
|---|---|---|---|
Age (years) | 12.0 (12.0, 13.0) | 12.0 (12.0, 13.0) | 0.186 |
Birthweight (g), n (%) | |||
< 2500 | 50 (5.4) | 10 (10.1) | 0.055 |
≥ 2500 | 883 (94.6) | 89 (89.9) | |
Height (cm) | 155.5 (149.2, 160.8) | 149.9 (144.6, 154.7) | <0.001 |
Weight (kg) | 43.7 (39.1, 48.3) | 33.0 (30.8, 36.2) | <0.001 |
Body mass index (kg/m2) | 18.0 (16.9, 19.2) | 15.0 (14.6, 15.3) | <0.001 |
Exercise, n (%) | |||
Daily | 788 (84.5) | 81 (81.8) | 0.325 |
Sometimes | 71 (7.6) | 6 (6.1) | |
None | 74 (7.9) | 12 (12.1) | |
Skipping breakfast, n (%) | |||
Yes | 45 (4.8) | 3 (3.0) | 0.421 |
No | 888 (95.2) | 96 (97.0) | |
Snacking after dinner, n (%) | |||
Always or often | 580 (62.2) | 57 (57.6) | 0.372 |
Seldom or none | 353 (37.8) | 42 (42.4) | |
Snacking while watching television or reading books, n (%) | |||
Yes | 383 (41.1) | 34 (34.3) | 0.196 |
No | 550 (59.0) | 65 (65.7) | |
Eating slowly, n (%) | |||
Yes | 161 (17.3) | 35 (35.4) | <0.001 |
No | 772 (82.7) | 64 (64.7) | |