Table 2.

Summary of clusters of pediatric brain tumor, Texas, 2000–2017.

Cluster	Population	Observed	Expected	Relative Risk	p-Value	No. of CTs in Cluster
1	291	13	0.1	106.8	0.000	1
2	657,049	360	276	1.3	0.01	451
3	2176	8	0.9	8.8	0.11	3
4	20,931	25	8.8	2.9	0.14	15
5	4186	10	1.8	5.7	0.28	3
6	11,646	17	4.9	3.5	0.29	7
7	811	5	0.3	14.7	0.37	1
8	145	3	0.1	49.3	0.38	1
9	8513	14	3.6	3.9	0.40	6
10	13,461	17	5.7	3.0	0.80	13
11	5235	10	2.2	4.6	0.81	4
12	24,885	25	10.5	2.4	0.83	22
13	250	3	0.1	28.6	0.86	1
14	171,893	105	72.2	1.5	0.95	143
15	1289	5	0.5	9.2	0.95	1
16	719	4	0.3	13.3	0.96	1
17	756	4	0.3	12.6	0.98	1
18	20,528	21	8.6	2.4	0.98	11
19	17,968	19	7.5	2.5	0.99	12
20	858	4	0.4	11.1	0.99	1

CTs—census tracts.