Fig. 1

Correlation between observed and predicted values of CPET maximal parameters using the Z-score model. The “underweight” group was represented by blue points, the “normal weight” group by green points, and the “overweight/obesity” group by red points. The correlation between measured and predicted values using the Z-score model for RER_max (panel A), workload_max (panel B) and O₂ pulse_max (panel C)