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Table 1 Descriptive sample characteristics in a study on ED consumption in Norwegian adolescents.

From: Consumption of energy drinks among adolescents in Norway: a cross-sectional study

Variable n (%)
School level
 Lower secondary schoola 19,268 (62.0)
 Upper secondary schoolb 11,823 (38.0)
Grade
 8 6316 (20.3)
 9 6117 (19.7)
 10 6469 (20.8)
 11 4934 (15.9)
 12 4118 (13.2)
 13 2705 (8.7)
 Missing 432 (1.4)
Gender
 Female 15,530 (50.0)
 Male 14,581 (46.9)
 Missing 980 (3.1)
Residencyc
 Urban 14,394 (46.3)
 Rural 16,697 (53.7)
Frequency of physical activityd
 Often 25,791 (83.0)
 Seldom 4351 (14.0)
 Never 573 (1.8)
 Missing 376 (1.2)
Leisure screen time
 Less than two hours 6755 (21.7)
 Two-three hours 7117 (22.9)
 Three-four hours 7614 (24.5)
 Four-six hours 5427 (17.5)
 More than six hours 3840 (12.4)
 Missing 338 (1.1)
Basis for calculating socioeconomic status index:
See Additional file 1  
  1. n = 31,091
  2. aLower secondary school includes grades 8–10 and ages 12–15 years b Upper secondary school includes grades 11–13 and ages 15–19 years c Urban residency: municipalities with ≥ 20,000 residents, rural residency: municipalities with < 20,000 residents. d Often: once a week or more, seldom: once to twice a month or less