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Table 3 Comparisons of characteristics between the normal weight and underweight groups in girls (Japan, 2001–2008)

From: Lifestyle factors associated with underweight among Japanese adolescents: a cross-sectional study

  Normal weight (n = 882) Underweight (n = 127) P valuea
Age (years) 12.0 (12.0, 13.0) 12.0 (12.0, 13.0) 0.017
Birthweight (g), n (%)
  < 2500 77 (8.7) 6 (4.7) 0.125
  ≥ 2500 805 (91.3) 121 (95.3)  
Height (cm) 153.4 (149.6, 157.1) 151.3 (147.1, 155.5) <0.001
Weight (kg) 43.5 (39.7, 46.9) 34.7 (32.3, 37.2) <0.001
Body mass index (kg/m2) 18.3 (17.2, 19.5) 15.3 (14.7, 15.5) <0.001
Exercise, n (%)
 Daily 547 (62.0) 65 (51.2) 0.033
 Sometimes 115 (13.0) 17 (13.4)  
 None 220 (24.9) 45 (35.4)  
Skipping breakfast, n (%)
 Yes 63 (7.1) 7 (5.5) 0.499
 No 819 (92.9) 120 (94.5)  
Snacking after dinner, n (%)
 Always or often 509 (57.7) 76 (59.8) 0.649
 Seldom or none 373 (42.3) 51 (40.2)  
Snacking while watching television or reading books, n (%)
 Yes 397 (45.0) 58 (45.7) 0.889
 No 485 (55.0) 69 (54.3)  
Eating slowly, n (%)
 Yes 203 (23.0) 56 (44.1) <0.001
 No 679 (77.0) 71 (55.9)  
  1. Except where indicated n (%), values are expressed as median (25, 75th percentile)
  2. aWilcoxon rank-sum test or chi-square test