1697 / 1708
TABLE II. Comparison of Demographic and Clinical Characteristics in the Intellectual Testing Subsample and Academic Achieve-
ment Subsample Versus the A9961 Patients Who Did Not Participate
At least baseline
intellectual testing, included in
analysis (N
¼
110)
No baseline intellectual
testing, not included in
analysis (n
¼
269)
At least baseline
academic achievement
testing, included in
analysis (n
¼
75)
No baseline academic
achievement testing,
not included in analysis
(n
¼
304)
Sex
Male
N
57
166
42
181
Percent
51.8
61.7
56.0
59.5
Female
N
53
103
33
123
Percent
48.2
38.3
44.0
40.5
Treatment regimen
A
N
57
130
41
146
Percent
51.8
48.3
54.7
48.0
B
N
53
139
34
158
Percent
48.2
51.7
45.3
52.0
Extent of resection
No tumor sampling/no surgery
N
0
1
0
1
Percent
0
0.4
0
0.3
Subtotal resection
N
2
10
2
10
Percent
1.8
3.7
2.7
3.3
Radical subtotal resection
N
12
60
9
63
Percent
10.9
22.3
12.0
20.7
Gross total
N
96
198
64
230
Percent
87.3
73.6
85.3
75.7
Amount of residual tumor
None/not visible
N
90
182
59
213
Percent
81.8
67.7
78.7
70.1
1.5 cm
2
N
10
53
7
56
Percent
9.1
19.7
9.3
18.4
>
1.5 to 3.0 cm
2
N
0
1
0
1
Percent
0
0.4
0
0.3
Tumor present, but not measurable
N
4
17
4
17
Percent
3.6
6.3
5.3
5.6
Equivocal for tumor
N
6
16
5
17
Percent
5.5
5.9
6.7
5.6
Cerebellar mutism syndrome
Yes
N
24
60
13
71
Percent
21.8
22.3
17.3
23.4
No
N
84
203
60
227
Percent
76.4
75.5
80.0
74.7
Unknown
N
2
6
2
6
Percent
1.8
2.2
2.7
2.0
Brain stem involvement
(
Continued
)
1352
Ris et al.
Pediatr Blood Cancer
DOI 10.1002/pbc