Table 2a.
Univariate Kaplan-Meier Analysis on Tumor Progression-Free Survival for Categorical Variables
| Covariate | Levels | PFS (years) | Survival | 95% Lower | 95% Upper | P-value |
|---|---|---|---|---|---|---|
| Tumor Location | Frontal | 2 | .903 | .816 | .950 | .918 |
| 5 | .643 | .526 | .738 | |||
| Insula | 2 | .833 | .273 | .975 | ||
| 5 | .500 | .111 | .804 | |||
| Parietal | 2 | .900 | .656 | .974 | ||
| 5 | .526 | .284 | .721 | |||
| Temporal | 2 | .829 | .637 | .925 | ||
| 5 | .563 | .358 | .725 | |||
| Extent of Resection | Subtotal | 2 | .898 | .814 | .946 | .835 |
| 5 | .616 | .503 | .712 | |||
| Gross-total | 2 | .858 | .725 | .930 | ||
| 5 | .578 | .424 | .704 | |||
| Seizure Frequency 6 Months Preop | None | 2 | .935 | .766 | .983 | .697 |
| 5 | .630 | .418 | .783 | |||
| Single | 2 | .899 | .774 | .957 | ||
| 5 | .621 | .467 | .742 | |||
| Few | 2 | .759 | .513 | .892 | ||
| 5 | .701 | .448 | .854 | |||
| Several | 2 | .893 | .738 | .958 | ||
| 5 | .514 | .344 | .660 | |||
| Seizure Frequency 6 Months Postopa | None | 2 | .931 | .852 | .968 | .114 |
| 5 | .642 | .526 | .736 | |||
| Single | 2 | 1.00 | . | . | ||
| 5 | .667 | .337 | .860 | |||
| Few | 2 | .765 | .488 | .904 | ||
| 5 | .510 | .254 | .718 | |||
| Several | 2 | .882 | .606 | .969 | ||
| 5 | .588 | .325 | .778 | |||
| Seizure Frequency 6 Months Postop (Categorized Into 2 Groups)a | None/Single | 2 | .939 | .870 | .972 | .017 |
| 5 | .644 | .537 | .733 | |||
| Few/Several | 2 | .824 | .650 | .917 | ||
| 5 | .549 | .367 | .699 | |||
| Seizure Frequency Change from 6 Months Preop to Postopa | None/Single → None/ Single | 2 | .984 | .889 | .998 | .038 |
| 5 | .667 | .528 | .773 | |||
| None/Single → Few/ Several | 2 | .750 | .463 | .898 | ||
| 5 | .545 | .274 | .753 | |||
| Few/Several → None/ Single | 2 | .865 | .805 | .941 | ||
| 5 | .609 | .430 | .747 | |||
| Few/Several → Few/ Several | 2 | .889 | .624 | .971 | ||
| 5 | .556 | .305 | .748 |
Abbreviations: min, minimum; max, maximum; PFS, progression-free survival; Postop, postoperatively; preop, preoperatively.
aPatients with tumor recurrence, lost to follow-up or deceased within 6 months postoperatively were excluded (n = 10).