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Table 3: Univariate analysis showing the association between findings on HC and the clinical-anatomic-demographic variables of patients treated by TVE
Variable Were There HC?
No (n = 49) Yes (n = 8) P
Spetzler-Martin grading system 1.0^{^a}
 I, II, and III 39 (68.5%) 7
 IV and V 10 (17.5%) 1
Previous rupture 1.0^{^a}
 No 16 3
 Yes 33 5
Sex .70^a
 Female 25 3
 Male 24 5
Mean age on admission (SD) (yr) 37.1 (18.6) 46.8 (13.6) .16^b
No. of venous collectors (mean) (SD) 1.2 (0.45) 2.0 (0.75) .003^{^c}
Presence of dilated draining vein (No.) (%) .06^a
 Evaluator 1 = 24/57 18 (31.5%) 6 (10.5%)
Presence of dilated draining vein (No.) (%) .14^a
 Evaluator 2 = 28/57 22 (38.5%) 6 (10.5%)
Presence of dilated draining vein (No.) (%) .69^a
 Evaluator 3 = 36/57 30 (52.6%) 6 (10.5%)
Pattern of venous drainage .48^{^a}
 Superficial 21 4
 Deep 25 3
 Superficial and deep 3 1
Nidus diameter before any intervention .01^b
  (mean) (SD) (cm) 2.74 (1.19) 3.88 (1.40)
Nidus diameter before TVE (mean) (SD) (cm) 2.28 (0.92) 3.37 (1.00) .003^b
Nidus diameter before TVE (2 groups) .03^{^a}
 0–3 cm 38 3
 >3 cm 11 5
AVM location .09^{^a}
 Cortical (lobar or cerebellum) 33 8
 Deep (brain stem, thalamus, or basal ganglia) 16 0
↵a Fisher exact test.
b Student t test.
↵c Mann-Whitney test.