Table 2.

Age-adjusted incidence trend statistics and linear correlation coefficients for primary malignant spinal cord glioma by variables of interest.

	APC statistic	APC p-value*	R2 value^
Overall	1.74	0.00038#	0.3572
Age at diagnosis
0–9	NC	NC	0.13
10–19	NC	NC	0.003
20–34	0.69	0.26	0.05
35–49	1.16	0.15	0.14
50–64	NC	NC	0.28
65+	NC	NC	0.26
Sex
Male	1.9	<0.0001#	0.17
Female	1.6	<0.0001#	0.14
Race
White	2.13	0.0001#	0.4
Black	NC	NC	0.03
Other	NC	NC	0.007
Histological Type
Astrocytoma Grade I	NC	NC	0.59
Astrocytoma Grade II	NC	NC	0.11
Astrocytoma Grade II–III	NC	NC	0.19
Astrocytoma Grade III	NC	NC	0.05
GBM	NC	NC	0.01
Astrocytoma, NOS	NC	NC	0.31
Ependymoma	3.17	<0.0001	0.58

^*APC - Annual Percentage Change statistic for trend

^{^}R2 value - measure of strength of linear trend (ranges between −1 and 1)

NC - Not calculable due to small sample sizes

^#increasing trend