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Table 2: AVM characteristics and factors associated with obliteration at initial GKRS
Total No. (n = 150) Obliteration (n = 104) (69.3%) Incomplete Obliteration (n = 46) (30.7%) P Value
Rupture (No.) (%) 53 (35.3) 33 (31.7) 20 (43.5) .13
Spetzler-Martin grade (No.) (%) <.001
 I/II 80 (53.3) 68 (65.4) 12 (26.1) 
 III/IV/V 70 (46.7) 36 (34.6) 34 (73.9) 
Median AVM score (range) 1.19 (0.289–3.92) 1.16 (0.289–2.23) 1.28 (0.302–3.92) .05
Deep drainage (No.) (%) 86 (57.3) 54 (52.0) 32 (69.6) .04
Location (No.) (%) .016
 Lobar 112 (74.7) 80 (76.9) 32 (69.6) 
 Thalamus/basal ganglia/brainstem 22 (14.7) 10 (9.6) 12 (26.1) 
 Cerebellum 16 (10.7) 14 (13.5) 2 (4.3) 
Eloquent cortex of adjacent brain (No.) (%) 82 (54.6) 50 (48.1) 32 (69.6) .02
Prior embolization (No.) (%) 15 (10.0) 10 (9.6) 5 (10.9) .77
Median AVM volume (range) (mL) 3.51 (0.026–31.3) 1.51 (0.026–13.6) 3.6 (0.027–31.3) .007
Median margin dose (range) (Gy) 20 (12–23) 20 (12–23) 18 (12–23) <.001