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Table 4 Adjusted odds ratios and 95% confidence intervals for underweight in boys (Japan, 2001–2008)

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

Lifestyle variables Total N Underweight n (%) AOR (95% CI) P value
Exercise
 Daily 869 81 (9.3) 1.00  
 Sometimes 77 6 (7.8) 0.89 (0.37–2.15) 0.802
 None 86 12 (14.0) 1.73 (0.88–3.38) P for trend = 0.173 0.111
Skipping breakfast
 Yes 48 3 (6.3) 0.70 (0.21–2.36) 0.568
 No 984 96 (9.8) 1.00  
Snacking after dinner
 Always or often 637 57 (9.0) 0.89 (0.57–1.38) 0.593
 Seldom or none 395 42 (10.6) 1.00  
Snacking while watching television or reading books     
 Yes 417 34 (8.2) 0.71 (0.45–1.12) 0.143
 No 615 65 (10.6) 1.00  
Eating slowly
 Yes 196 35 (17.9) 2.78 (1.77–4.39) <0.001
 No 836 64 (7.7) 1.00  
  1. AOR adjusted odds ratio, CI confidence interval
  2. Age (years), birthweight (<2500 g or ≥2500 g), and all lifestyle variables were included for adjustment