Patient demographic and clinical characteristics

Characteristic	Value
Sex (male:female)	16:9
Handedness (R:L)	16:9
Risk Group
Average	16
High	9
Race
Caucasian	15
African American	7
Latino	2
Asian	1
Shunted hydrocephalus (yes:no)	9:16
Dexamethasone use (yes:no)	20:5
Seizure history (yes:no)	4:21
Posterior fossa syndrome	18:7
Parental education (y)*	14.8 ± 2.80 (8.00–20.00)
Age at diagnosis (y)*	8.27 ± 2.66 (4.78–12.98)
Time since diagnosis (y)*
To first MR study	0.31 ± 0.24 (0.03–0.94)
To all MR studies	1.82 ± 1.26 (0.03–4.88)

^*Data are the mean ± SD (range).