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 age2 (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, p < 0.05 (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).