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Table 1 Characteristics of the sample at the baseline, by sex

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

VariablesTotal
n (%)
Boys
n (%)
Girls
n (%)
p-value*
Age (years
9 to 111421 (56.2)679 (51.1)742 (61.8)< 0.001
12 to 171.107 (43.8)649 (48.9)458 (38.2) 
Weight status
 Thinness80 (3.3)58 (4.6)22 (1.9)< 0.001
 Adequate1.588 (65.0)841 (65.9)747 (64.0) 
 Overweight449 (18.3)202 (15.8)247 (21.1) 
 Obesity327 (13.4)175 (13.7)152 (13.0) 
Physical activity (min/week)
 Inactive562 (22.4)253 (19.2)309 (25.9)< 0.001
 insufficiently active (1–149)1.101 (43.9)563 (42.8)538 (45.1) 
 insufficiently active (150–299)469 (18.7)284 (21.6)185 (15.5) 
 Active (> = 300)378 (15.0)217 (16.5)161 (13.5) 
Sleep duration (h/day)
 Short712 (34.3)348 (32.9)364 (35.8)0.001
 Adequate1.190 (57.4)613 (58.0)577 (56.7) 
 Long172 (8.3)96 (9.1)76 (7.5) 
CMD frequency
 Yes834 (33.2)486 (36.9)348 (29.2)< 0.001
 No1.678 (66.8)832 (63.1)846 (70.8) 
CMD scoremean (SD)mean (SD)mean (SD)p-value**
0–3611.7 (8.1)12.5 (8.3)10.9 (7.8)< 0.001
  1. 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
  2. CMD Common mental disorders
  3. *Chi-square test between variables and sex. ** Student’s T test between CMD scores, ranging from 0 to 36, and the students’ gender