Adolescent Trajectories of Aerobic Fitness and Adiposity as Markers of Cardiometabolic Risk in Adulthood

Table 2

Multilevel regression models for aerobic fitness, adiposity, and obesity status measures.

Variable	AbsVO2	Sum6SF	TrunkSF	BMI
Fixed effects
Constant	−2.52 ± 1.02	97.81 ± 24.66	17.28 ± 7.98	12.85 ± 1.94
Biological age (yrs)	NS	3.25 ± 1.03	1.45 ± 0.35	0.45 ± 0.08
Biological age^2 (yrs)	NS	−0.13 ± 0.05	NS	NS
Height (cm)	0.03 ± 0.01	NS	NS	0.35 ± 0.01
Sex	NS	NS	NS	NS
CMR group	NS	NS	NS	NS
Random effects
Level 1
Constant (εij)	0.20 ± 0.02	82.01 ± 5.40	13.29 ± 0.87	0.38 ± 0.03
Level 2
Constant (µj)	0.31 ± 0.06	333.32 ± 61.93	42.71 ± 8.03	3.84 ± 0.69
Biological age (νjXij)	0.04 ± 0.01	35.99 ± 8.12	5.71 ± 1.17	0.31 ± 0.07
Constant∗biological age (µj∗νjXij)	0.009 ± 0.002	6.36 ± 1.36	0.89 ± 0.19	0.04 ± 0.01

All numerical values are reported as significant, (mean > 2∗SEE). NS = not significant and variable removed from the final model. Fixed effect values are estimated mean coefficients ± SEE (standard error estimate) for absolute VO₂ (AbsVO₂, ml/min), sum of six skinfolds (Sum6SF, mm), trunk skinfolds (TruckSF, mm), and body mass index (BMI, kg/m²). Random effects values are estimated mean variance ± SEE. Biological age is years centered around peak height velocity years of age (yrs). Height (cm); sex (male = 0, females = 1). Cardiometabolic risk group (CMR group; 0 = low CMR, 1 = high CMR).