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Table 3 Tracking of physical characteristics, fitness and physical activity levels between age 15y and young adulthood (mean age 22.0y)

From: Tracking of physical activity, fitness, body composition and diet from adolescence to young adulthood: The Young Hearts Project, Northern Ireland

  Males Females
  n κ P n κ P
Weight (kg) 245 0.337 <0.0001 231 0.540 <0.0001
Height (m) 245 0.444 <0.0001 231 0.813 <0.0001
Body mass index (kgm-2) 245 0.422 <0.0001 231 0.452 <0.0001
Biceps skinfold (mm) 244 0.224 <0.0001 230 0.403 <0.0001
Triceps skinfold (mm) 244 0.292 <0.0001 230 0.287 <0.0001
Subscapular skinfold (mm) 244 0.274 <0.0001 230 0.371 <0.0001
Suprailiac skinfold (mm) 244 0.223 <0.0001 230 0.202 <0.0001
Sum of skinfolds (mm) 244 0.216 <0.0001 230 0.357 <0.0001
VO2maxa 222 0.150 <0.0001 209 0.076 0.128
Physical activity scoreb 240 0.202 <0.0001 225 0.021 0.669
  1. a VO2max at age 15y was derived from the number of 20 metre shuttle run laps completed by each subject. At follow-up, VO2max was extrapolated from the results of a cycle ergometer test (Physical Work Capacity at a heart rate of 170 bpm; PWC170).
  2. b Physical activity scores at age 15y were calculated according to the method of Riddoch et al (1991). At follow-up, a modification (Pereira et al, 1997) of the Baecke questionnaire was used.
  3. κ indicates extent of tracking, and can be interpreted as follows: κ < 0.20, poor tracking; κ 0.21–0.40, fair; κ 0.41–0.60, moderate; κ 0.61–0.8, good; κ 0.81–1.0, very good (Altman, 1991).