Table 1.

Patient characteristics at the time of gamma knife surgery

Patient characteristics	Interval between 2 MRI studies (d)
	1–85	1–42	1–14
Total number of patients	1086	1045	640
Total number of metastases	4304	4138	2548
Gender
Male	683 (62.9%)	651 (62.3%)	403 (63.0%)
Female	403 (37.1%)	394 (37.7%)	237 (37.0%)
Age (yrs; median [range])	65 [30–91]	65 [30–91]	66 [30–91]