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Table 6 Adjusted odds ratios and 95% confidence intervals for underweight in total participants (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 1481 146 (9.9) 1.00  
 Sometimes 209 23 (11.0) 1.16 (0.72–1.87) 0.546
 None 351 57 (16.2) 1.59 (1.11–2.27) P for trend = 0.012 0.011
Skipping breakfast
 Yes 118 10 (8.5) 0.69 (0.35–1.37) 0.295
 No 1923 216 (11.2) 1.00  
Snacking after dinner
 Always or often 1222 133 (10.9) 0.98 (0.73–1.32) 0.903
 Seldom or none 819 93 (11.4) 1.00  
Snacking while watching television or reading books
 Yes 872 92 (10.6) 0.86 (0.64–1.16) 0.322
 No 1169 134 (11.5) 1.00  
Eating slowly
 Yes 455 91 (20.0) 2.67 (1.99–3.59) <0.001
 No 1586 135 (8.5) 1.00  
  1. AOR adjusted odds ratio, CI confidence interval
  2. Sex, age (years), birthweight (<2500 g or ≥2500 g), and lifestyle variables were included in the adjustment