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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

Variables Total
n (%)
Boys
n (%)
Girls
n (%)
p-value*
Age (years
9 to 11 1421 (56.2) 679 (51.1) 742 (61.8) < 0.001
12 to 17 1.107 (43.8) 649 (48.9) 458 (38.2)  
Weight status
 Thinness 80 (3.3) 58 (4.6) 22 (1.9) < 0.001
 Adequate 1.588 (65.0) 841 (65.9) 747 (64.0)  
 Overweight 449 (18.3) 202 (15.8) 247 (21.1)  
 Obesity 327 (13.4) 175 (13.7) 152 (13.0)  
Physical activity (min/week)
 Inactive 562 (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)
 Short 712 (34.3) 348 (32.9) 364 (35.8) 0.001
 Adequate 1.190 (57.4) 613 (58.0) 577 (56.7)  
 Long 172 (8.3) 96 (9.1) 76 (7.5)  
CMD frequency
 Yes 834 (33.2) 486 (36.9) 348 (29.2) < 0.001
 No 1.678 (66.8) 832 (63.1) 846 (70.8)  
CMD score mean (SD) mean (SD) mean (SD) p-value**
0–36 11.7 (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