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Table 1 Descriptive characteristics of high school students from the Danish National Youth Study 2014

From: School and class-level variations and patterns of physical activity: a multilevel analysis of Danish high school students

  Total Boys Girls
  n (%) n (%) n (%)
Study population 70,674 (100) 27,732 (39) 42,942 (61)
Age, mean years (SD) 18 (1.6) 18 (2.0) 18 (1.3)
School grade
 1st grade 26,410 (37) 10,336 (37) 16,074 (37)
 2nd grade 24,551 (35) 9673 (35) 14,878 (35)
 3rd grade 19,713 (28) 7723 (28) 11,990 (28)
Ethnicity
 Danish 62,647 (90) 24,059 (89) 38,588 (91)
 Danish and other 4853 (7.0) 2064 (7.6) 2789 (6.6)
 Other than Danish 2075 (3.0) 1013 (3.7) 1062 (2.5)
Parents’ educational level
 Basic schooling 2803 (4.2) 909 (3.5) 1894 (4.7)
 Vocational or high school 22,859 (35) 7923 (31) 14,936 (37)
 Higher education 40,603 (61) 17,009 (66) 23,594 (58)
Cohabitation
 Living with both parents 44,935 (64) 18,033 (66) 26,902 (63)
 Living with one parent 19,832 (28) 7381 (27) 12,451 (29)
 Other 5412 (7.7) 2095 (7.6) 3317 (7.8)
Degree of urbanisation
 Densely populated area 19,793 (28) 8080 (29) 11,713 (27)
 Intermediate populated density area 28,856 (41) 11,427 (41) 17,429 (41)
 Thinly populated area 22,025 (31) 8225 (30) 13,800 (32)
  1. Abbreviations: SD standard deviation
  2. Data are presented as proportions (%) except for age, which is presented as mean (SD). n does not sum up to the total study population for all variables due to missing answers on some items