Table 5. Final predictive equations.
| CPET variable | Constant | Height (cm) | Weight (kg) | Gender | Fenestration | Ventricular looping | R2 | Standard error of estimate |
|---|---|---|---|---|---|---|---|---|
| Peak VO2 (L/min) | −1.71 | 0.016 | 0.008 | 0.243 | 0.61 | 0.29 | ||
| Maximum O2 pulse (mL O2/beat) | −11.89 | 0.111 | 0.043 | 1.51 | 0.59 | 1.92 | ||
| Maximum work (W) | −153.47 | 1.35 | 0.66 | 17.72 | 0.61 | 24.2 | ||
| VO2 at AT (L/min) | −0.933 | 0.011 | 0.218 | 0.15 | 0.46 | |||
| Work at AT (W) | −3.97 | 0.926 | 9.976 | −4.762 | 0.39 | 18.9 | ||
| O2 pulse at AT (mL O2/beat) | −9.581 | 0.088 | 0.044 | 1.271 | 0.34 | 2.8 | ||
| VE/VCO2 at AT | 50.91 | −0.169 | 1.851 | −4.784 | 0.18 | 8.21 | ||
| VE/VO2 at AT | 48.04 | −0.134 | 2.086 | −5.164 | 0.18 | 9.01 |
Final equations are: CPET variable = constant + [Coefficient1*Covariate1] + [Coefficient2*Covariate2]… Example: For a 170 cm and 70 kg male, fenestration present and l-looped ventricle: predicted peak VO2 (L/min) ± one SD = −1.71 + [0.016*170 cm] + [0.008*70 kg] + [0.243*1] = 1.813 L/min ± 0.29. Predicted VE/VCO2 at AT ± one SD = 50.91 + [−0.169*70 kg] + [1.851*2] + [−4.784*1) = 38 ± 9. For categorical variables: gender (0 = male, 1 = male); fenestration (0 = no, 1 = indeterminate, 2 = yes); Ventricular looping (0 = d-loop, 1 = l-loop)
All constant and coefficients of covariates were significant (p < 0.05), blank fields represent covariates not in final equation CPET cardiopulmonary exercise testing, AT anaerobic threshold