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Table 2 CMD frequency at baseline, according to population characteristics, by sex

From: Gender differences in the impact of sleep duration on common mental disorders in school students

Variables CMD
Boys (%)
n = 486
Girls (%)
n = 348
Age (years)   p chi2   p chi2
 9 to 11 37.4 0.661 26.4 0.007
 12 to 17 36.3   33.7  
Economic status   p trend   p trend
 1° quintile 27.0 < 0.001 28.5 0.017
 2° quintile 32.3   24.7  
 3° quintile 34.1   26.6  
 4° quintile 35.5   28.1  
 5° quintile 50.6   40.3  
Weight status   p trend   p trend
 Thinness 32.8 0.009 36.4 0.052
 Adequate 39.5   30.2  
 Overweight 32.3   27.8  
 Obesity 32.6   23.0  
Physical activity (min/week)   p trend   p trend
 Inactive 21.3 < 0.001 25.8 < 0.001
 insufficiently active (1–149) 30.9   25.1  
 insufficiently active (150–299) 43.0   34.6  
 Active (> = 300) 62.7   42.9  
Sleep duration (h/day)   p chi2*   p chi2*
 Short 39.6 0.012 28.1 0.479
 Adequate 31.6   26.0  
 Long 34.4 0.586 27.6 0.761
  1. *Chi-square test between “short and adequate sleep duration” and “long and adequate sleep duration”, and CMD, by sex
  2. Adequate sleep duration: for children of school-age (6 to 12 years), 9 to 12 h is recommended and, for adolescents (13 to 18 years), 8 to 10 h