Spetzler-Martin inputsPoints
AVM size: <3 cm
  1
3-6cm
  2
>6 cm  3
Deep venous drainage:
No
  0
Yes
  1
Eloquence:
No
  0
Yes
  1
Supplemented score inputsPoints
Age: <20 years
  1
20-40 years
  2
>40 years  3
Unruptured presentation:
No
  0
Yes
  1
Diffuse nidus:
No
  0
Yes
  1
Spetzler-Martin (1-5):Probability of worsening at 1 year: %, 95% CI: ( % to %)
SM-Supplemented (2-10):Probability of worsening at 1 year: %, 95% CI: ( % to %)
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