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Table 1 Characteristics for participants 15–17 years old

From: Bone mineral density at the hip and its relation to fat mass and lean mass in adolescents: the Tromsø Study, Fit Futures

  GIRLS
n = 395
BOYS
n = 363
Age, year 16.6 (0.4) 16.7 (0.4)
Height, m 1.65 (0.06) 1.77 (0.07)
Weight, kg 60.7 (11.5) 69.8 (13.3)
BMI, kg/m2 22.2 (3.9) 22.2 (3.8)
Lean mass, kg 38.7 (4.6) 53.9 (6.6)
Fat mass, kg 20.1 (8.8) 14.1 (10.1)
Menarche age girls, years 13.0 (1.2)  
Puberty boys, PDS score
(Range 1; Not started – 4; Completed)
  3.3 (0.4)
Puberty boys, PDS groups, % (n)
Completed/ Underway/ Barely started/ Not started
  8.3 (30)/75.2 (273)/16.5(60)/0(0)
Serum VitD, nmol/l 54.8 (23.1) 40.8 (20.2)
Physical activity levels, % (n)
 • Sedentary 12.7 (50) 27.8 (101)
 • Moderate 40.0 (158) 23.7 (86)
 • Sports 30.1 (119) 22.0 (80)
 • Hard training 17.2 (68) 26.4 (96)
Smoking habits, daily or sometimes, % (n) 19.2 (76) 21.2 (77)
Alcohol consumption, sometimes, % (n) 74.9 (296) 68.0 (247)
Calcium intake, cheese weekly/diary daily, % (n) 88.4 (349) 90.4 (328)
aBMD, g/cm2
 • Total hip 1.062 (0.123) 1.120 (0.149)
 • Femoral neck 1.069 (0.124) 1.109 (0.149)
  1. Displayed as mean (SD) for continuous variables and % (n) for categorical variables. The Tromsø Study, Fit Futures 1