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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

VariablesCMD
Boys (%)
n = 486
Girls (%)
n = 348
Age (years) p chi2 p chi2
 9 to 1137.40.66126.40.007
 12 to 1736.3 33.7 
Economic status p trend p trend
 1° quintile27.0< 0.00128.50.017
 2° quintile32.3 24.7 
 3° quintile34.1 26.6 
 4° quintile35.5 28.1 
 5° quintile50.6 40.3 
Weight status p trend p trend
 Thinness32.80.00936.40.052
 Adequate39.5 30.2 
 Overweight32.3 27.8 
 Obesity32.6 23.0 
Physical activity (min/week) p trend p trend
 Inactive21.3< 0.00125.8< 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*
 Short39.60.01228.10.479
 Adequate31.6 26.0 
 Long34.40.58627.60.761
  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