Table 2.

Association of clinical variables with overall survival across cohorts.

Variable	TCGA			Schabath			Der			Rousseaux			WashU
	n	HR∗	p	n	HR∗	p	n	HR∗	p	n	HR∗	p	n	HR∗	p
Age		0.83–2.14	0.24		0.87–2.17	0.17		0.77–2.73	0.25		1.1–3.8	0.02		0.7–1.9	0.57
<65	92			103			40			27			55
≥65	128			271			84			55			27
Gender		0.52–1.30	0.41		1.1–2.4	0.016		0.81–2.47	0.22		0.5–2.3	0.83		1.1–3.0	0.02
Male	97			164			64			64			37
Female	123			210			60			18			44
Stage		1.7–4.3	1.6E-6		1.9–4.4	1.6E-7		NA	NA		NA	NA		NA	NA
I & II	162			305			124			80			81
III & IV	58			69			0			2

^∗95% confidence interval.