Table 2.

Pre- and post-Gamma Knife Penn Facial Pain Scale-Revised (PFPS-R) scores

	Baseline	Short-term**	Long-term* (N=41)
Pain intensity items	5.4 ± 0.2	2.5 ± 0.2 (44 ± 4.9 %)	1.4 ± 0.4 (72 ± 7.2 %)
General ADL interference items	5.5 ± 0.2	2.3 ± 0.2 (49 ± 5.0 %)	1.3 ± 0.4 (78 ± 6.4 %)
Facial ADL interference items	6.8 ± 0.2	2.9 ± 0.2 (50 ± 4.5 %)	1.3 ± 0.4 (77 ± 7.1 %)
All items	6.0 ± 0.2	2.5 ± 0.2 (49 ± 4.1 %)	1.3 ± 0.4 (77 ± 6.4 %)

Table values represent group-average scores, shown separately for each of the three dimensions of the PFPS-R, as well as for the entire questionnaire. For each subject, we calculated the average absolute score across the items comprising each of the three dimensions of the PFPS-R, as well as across all 18 items of the questionnaire. We also show the percentage change at short- and long-term follow up in parenthesis. The pre- vs. post-GK absolute scores were compared using a paired-sample Wilcoxon signed rank test (*p < 10⁻⁶, **>p < 10−20).