TABLE 3.

Rates of SH and AC in patient-years according to clinical presentation and location of index lesion

Presentation, Location	No. of Patients	Patient-Years	SH	Rate of SH (95% CI)	AC	Rate of AC (95% CI)
SH, brainstem	42	98.2	10	10.2% (5.7–18.3)	14	14.3% (8.8–23.2)
SH, nonbrainstem	32	69.5	9	12.9% (7.0–23.8)	19	27.3% (18.6–40.1)
Non-SH, brainstem	13	23.3	4	17.1% (7.0–41.8)*	8	34.3% (19.5–60.1)*
Non-SH, nonbrainstem	105	220.7	8	3.6% (1.8–7.2)*	12	5.4% (3.1–9.4)*

^*Values are statistically significantly different (p < 0.05).