Skip to main content

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)
FF1FF2FF1FF2
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/never12.1 (35)14.0 (39)11.1 (39)11.7 (41)
 1–3 times weekly14.8 (43)15.8 (44)15.0 (53)17.1 (60)
 4–6 times weekly20.3 (59)25.5 (71)19.8 (70)24.2 (85)
 Daily52.8 (153)44.8 (125)54.1 (191)47.0 (165)
Screen time (hours per weekday)
 0–0.5 h3.8 (11)5.0 (14)3.7 (13)4.6 (16)
 1–1.5 h12.3 (36)14.2 (40)24.7 (87)27.9 (98)
 2–3 h38.4 (112)31.0 (87)40.3 (142)37.3 (131)
 4-6 h37.0 (108)38.1 (107)25.0 (88)21.9 (77)
   7 h8.6 (25)11.7 (33)6.3 (22)8.3 (29)
Leisure time physical activity (hours per week)
 Inactive30.5 (89)37.1 (104)27.4 (97)36.2 (127)
 0.5–1.5 h8.9 (26)8.2 (23)8.5 (30)12.0 (42)
 2 to 3 h16.8 (49)11.4 (32)22.6 (80)16.5 (58)
 4 to 6 h23.6 (69)21.8 (61)27.1 (96)23.1 (81)
  ≥ 7 h20.2 (59)21.4 (60)14.4 (51)12.3 (43)
Activity status: activec60.6 (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