Table 1.

Primary sources for the exams processed in this study. In total, eight North American academic cancer centers, three public domain datasets, and one consortium dataset contributed exams. “Study source” indicates the origin of the MRI exams. “$N$” indicates the number of exams contributed. “Age” is the mean age (±standard deviation) of the patients when the exam was obtained. “M/F (not specified)” indicates the number of male (M) and female (F) patients in the group. The number of patients whose sex was not specified is indicated in brackets. “Study dates” lists the range of years the exams were acquired, with the median year indicated in brackets. The last row provides summary values for the entire cohort.

	Study source	N	Age	M/F (not specified)	Study dates
1	Cancer centers ($n=8$)	525	$53.1\pm 15.9$	338/187	2000 to 2016 (2008)
2	TCGA-GBM	101	$58.4\pm 14.4$	63/38	1996 to 2008 (2001)
3	TCIA	85	$45.6\pm 15.6$	33/24 (28)	1990 to 2005 (1994)
4	Ivy GAPa	18	$56.7\pm 13.4$	7/11	1996 to 2000 (1997)
5	Radiation therapy oncology group	12	$66.9\pm 17.0$	10/2	2009 to 2011 (2010)
	Overall	741	$53.5\pm 16.0$	451/262 (28)	1990 to 2016 (2006)

^aIvy Glioblastoma Atlas Project.