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Table 1 Characteristics of the longitudinal cohort of the Tromsø Study; Fit Futures 2010–11 and Fit Futures 2012–13a

From: Longitudinal changes in body composition and waist circumference by self-reported levels of physical activity in leisure among adolescents: the Tromsø study, Fit Futures

 

Boys (n = 292)

Girls (n = 354)

FF1

FF2

FF1

FF2

Age (years)

16.1 (0.4)

18.2 (0.4)

16.1 (0.4)

18.2 (0.4)

Height (cm)

177.3 (6.5)

179.1 (6.5)

165.0 (6.5)

165.7 (6.6)

Body weight (kg)

69.9 (13.7)

75.3 (14.7)

60.4 (10.7)

63.1 (12.0)

Body mass index (BMI)

22.2 (3.9)

23.4 (4.2)

22.2 (3.8)

23.0 (4.2)

Body weight categoryb

 Underweight (BMI < 18.5)

8.6 (25)

8.2 (24)

5.9 (21)

4.5 (16)

 Normal weight (18.5 ≤ BMI < 25)

70.2 (205)

63.7 (186)

75.1 (266)

74.6 (264)

 Overweight (25 ≤ BMI < 30)

14.7 (43)

19.9 (58)

14.1 (50)

14.7 (52)

 Obese (BMI ≥ 30)

6.5 (19)

8.2 (24)

4.8 (17)

6.2 (22)

Waist circumference (cm)

81.5 (11.0)

84.7 (11.8)

76.6 (9.6)

77.7 (11.1)

Total Body Fat Mass (kg)

14.3 (10.6)

16.7 (11.6)

19.8 (8.2)

21.6 (9.3)

Fat Mass Index (FMI)

4.5 (3.3)

5.2 (3.5)

7.3 (3.1)

7.9 (3.4)

Total Body Lean Mass (kg)

53.8 (6.6)

56.1 (7.0)

38.6 (4.5)

39.2 (4.8)

Lean Mass Index (LMI)

17.1 (1.6)

17.5 (1.8)

14.2 (1.3)

14.2 (1.4)

Regularity of eating breakfast

 Rarely/never

12.1 (35)

14.0 (39)

11.1 (39)

11.7 (41)

 1–3 times weekly

14.8 (43)

15.8 (44)

15.0 (53)

17.1 (60)

 4–6 times weekly

20.3 (59)

25.5 (71)

19.8 (70)

24.2 (85)

 Daily

52.8 (153)

44.8 (125)

54.1 (191)

47.0 (165)

Screen time (hours per weekday)

 0–0.5 h

3.8 (11)

5.0 (14)

3.7 (13)

4.6 (16)

 1–1.5 h

12.3 (36)

14.2 (40)

24.7 (87)

27.9 (98)

 2–3 h

38.4 (112)

31.0 (87)

40.3 (142)

37.3 (131)

 4-6 h

37.0 (108)

38.1 (107)

25.0 (88)

21.9 (77)

   7 h

8.6 (25)

11.7 (33)

6.3 (22)

8.3 (29)

Leisure time physical activity (hours per week)

 Inactive

30.5 (89)

37.1 (104)

27.4 (97)

36.2 (127)

 0.5–1.5 h

8.9 (26)

8.2 (23)

8.5 (30)

12.0 (42)

 2 to 3 h

16.8 (49)

11.4 (32)

22.6 (80)

16.5 (58)

 4 to 6 h

23.6 (69)

21.8 (61)

27.1 (96)

23.1 (81)

  ≥ 7 h

20.2 (59)

21.4 (60)

14.4 (51)

12.3 (43)

Activity status: activec

60.6 (177)

54.6 (153)

64.1 (227)

51.9 (182)

Change in activity status

 Consistently inactive

 

27.1 (76)

 

25.1 (88)

 Quitters

 

18.2 (51)

 

23.1 (81)

 Adopters

 

11.8 (33)

 

11.1 (39)

 Consistently active

 

42.9 (120)

 

40.7 (143)

  1. aValues are means with standard deviation (SD) or prevalence in percentages (n). BMI Body weight in kg/height in meters2, FMI Fat mass in kg/height in meters2, LMI Lean mass in kg/height in meters2
  2. bBMI (kg/m2) categories according to the International Obesity Task Force reference-standard [24, 25]
  3. cParticipants with 2 h or more of physical activity in leisure time per week