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Table 2 Sleep characteristic in adolescents stratified by different categories of body-mass index (BMI)

From: Sleep and body mass index in adolescence: results from a large population-based study of Norwegian adolescents aged 16 to 19 years

  Underweight Normal weight Overweight Obesity
Sleep duration category (weekdays)     
 Short sleeper (<1SD: 5 hours), % (n) 27.3% (39) 13.2%(972)* 18.3% (2253) 24.2% (81)
 Normal Sleeper, (5–8 hours) % (n) 65.7% (94) 76.4% (5636) 72.1% (997) 66.6% (223)
 Long sleeper (1 > SD: 8 hours), % (n) 7.0% (10) 10.4% (769) 9.6% (133) 9.3% (31)
Sleep duration weekdays, mean (SD) 5:48 (1:51) 6:29 (1:36)* 6:13 (1:43) 5:57 (1:57)
Sleep duration weekends, mean (SD) 8:28 (2:09) 8:41 (1:47)* 8:26 (1:59) 8:09 (2:08)
Insomnia 19.3% (28) 12.6% (943)* 16.4% (230) 20.1% (68)
OSA symptoms, % (n) 1.6% (2) 3.2% (194)* 6.8% (77) 12.8% (35)
  1. *p < .001; p-values are based on Chi-square tests (proportions) and ANOVAS (means).