Table 3.
Twin correlations by zygosity, estimates of genetic and environmental influences on phenotypes, and model fit statistics from biometric analyses.
| Measures | r (MZ) | r (DZ) | a2 | c2 | e2 | χ2 | p | AIC |
|---|---|---|---|---|---|---|---|---|
| COMPX (%) | 0.13 | 0.35 | -- | 22% | 78% | 1.19 | 0.88 | −6.81 |
| Adjusted COMPX (%) | 0.05 | 0.31 | -- | 17% | 83% | 1.57 | 0.81 | −6.43 |
| BMI (kg/m2) | 0.72 | 0.45 | 76% | -- | 24% | 4.197 | 0.38 | −3.80 |
| Waist Circumference (cm) | 0.81 | 0.64 | 79% | -- | 21% | 9.24 | 0.06 | 1.24 |
| Adjusted Waist Circumference (cm) | 0.73 | 0. 50 | 73% | -- | 27% | 3.35 | 0.50 | −4.65 |
| Total Body Fat (%) | 0.87 | 0.35 | 91% | -- | 9% | 8.190 | 0.09 | 0.20 |
| Adjusted Body Fat (%) | 0.80 | 0.35 | 90% | -- | 10% | 14.98 | 0.01 | 7.98 |
Notes: COMPX= Compensation Index (%), refers to child self-regulatory eating capacity and measured by laboratory preloading challenge; Adjusted COMPX scores were statistically adjusted for child sex and ethnicity (dummy coded); BMI z-score= Body Mass Index z-score, calculated from the CDC growth charts; Total body fat (%) = Percentage total body fat, measured by dual energy X-ray absorptiometry; Adjusted percent body fat scores were statistically adjusted for child sex.