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Table 1 Demographic and clinical 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
N (%) 145 (1.5%) 7499 (79.8%) 1411 (15.0%) 341 (3.6%)
Age, mean (SD) 17.4 (0.8) 17.4 (0.8)* 17.5 (0.8) 17.5 (0.9)
BMI, mean (SD) 16.0 (0.6) 21.0 (1.9)* 26.5 (1.4) 32.8 (3.2)
Gender     
 Girls, % (n) 8.3% (421) 77.1% (3915)* 11.6% (590) 3.0% (151)
 Boys, % (n) 5.0% (216) 76.7% (3348) 14.7% (642) 3.6% (157)
Fathers with college education, % (n) 28.3% (41) 38.9% (2914)* 31.7% (447) 25.8% (88)
Mothers with college education, % (n) 23.4 (34) 34.3% (2573)* 25.8% (364) 16.4% (56)
Poorer family economy, % (n) 12.7% (27) 6.4% (470)* 8.4% (116) 15.1% (51)
Physical activity (days/wk), %     
 None 25.5% (36) 42.4% (3053)* 35.3% (478) 26.5% (87)
 1-3 days 53.9 (76) 48.8% (3511) 51.8% (701) 58.5 (192)
 4 + days 20.6% (29) 8.7% (628) 12.9% /(175) 14.9% (49)
Depression (SMFQ score), mean (SD) 8.4 (6.4) 5.5 (5.5)* 6.4 (6.0) 8.1 (7.2)
  1. *p < .001; p-values are based on Chi-square tests (proportions) and ANOVAS (means).