TABLE 1.

Basic Demographic Data

Variable	n, % or mean, SD (range)
Left:right	109 (50.7%):106 (49.3%)
Age	Mean 52.2, median 54 (21.7-86.1)
Sex
Male:female	104 (48.4%):111 (51.6%)
Symptom at discovery
Hearing loss	124 (57.7%)
Vertigo	42 (19.5%)
Tinnitus	25 (11.6%)
Incidental	24 (11.2%)
Koos grade at baseline
I	65 (30.2%)
II	75 (34.9%)
III	72 (33.5%)
IV	3 (1.4%)
Baseline hearing (GR class)
1	154 (71.6%)
2	59 (28.4%)
PTA
Baseline	32.9 ± 14.4 (3.7-66.2)
6 mo after GK	38.7 ± 18.7 (2.5-110)
12 mo after GK	42.2 ± 18.6 (2.5-130)
36 mo after GK	44.4 ± 19.2 (2.5-97.5)
60 mo after GK	47.1 ± 18.5 (5-95)

GK, Gamma Knife; GR, Gardner–Robertson; PTA, pure tone average.

Adapted from the study by Tuleasca et al,¹⁸ by permission from the Congress of Neurological Surgeons.