TABLE 2.
Relationships between adjustable valve pressure setting and ventricular volume subjected to regression analyses, and the variables with their definitionsa
| Relationships between adjustable valve pressure setting and ventricular volume | |
| 1 | Individual values of P and V across all subjects |
| 2 | Individual values of ΔP and corresponding values of ΔV across all subjects |
| 3 | Average individual values of P and V within each subject |
| 4 | Average values for ΔP and ΔV within each subject |
| 5 | Average ΔP/ΔT and ΔV/ΔT for each subject |
| 6 | The differences between Pmax – Pmin and Vmax – Vmin within each subject |
| 7 | The differences between Pfinal – Pinitial and Vfinal – Vinitial within each subject |
| 8 | Corresponding values of ΔP and ΔV within each subject |
| Definition of abbreviations | |
| (P) | Adjustable valve pressure setting |
| (V) | Ventricular volume |
| (ΔP) | Change in adjustable valve pressure setting |
| (ΔV) | Change in ventricular volume |
| (ΔP/ΔT) | Change in adjustable valve pressure setting over time |
| (ΔV/ΔT) | Change in ventricular volume over time |
| (Pmax) | Highest adjustable valve pressure setting |
| (Pmin) | Lowest adjustable valve pressure setting |
| (Vmax) | Largest ventricular volume |
| (Vmin) | Smallest ventricular volume |
| (Pfinal) | Last value for adjustable valve pressure setting available for each subject |
| (Pinitial) | First value for adjustable valve setting as determined at time of shunt surgery |
| (Vfinal) | Last value for ventricular volume available for each subject |
| (Vinitial) | First ventricular volume measure available at first computed tomographic scan after surgery |