Table 2. . Kaplan–Meier median overall survival time estimates with 95% confidence intervals with log rank p-values.

Variable	Class	Median OS in months (95% CI)	p-value
Age	<65 years	136.3 (129.2–144.0)	<0.0001
	≥65 years	39.2 (38.0–40.6)
Race	Other	66.7 (61.5–72.8)	0.0595
	Caucasian	73.5 (71.4–76.5)
Sex	Female	116.9 (110.2–125.7)	<0.0001
	Male	58.6 (56.9–60.7)
Insurance status	Medicaid/other government	49.3 (45.5–56.9)	<0.0001
	Medicare	39.2 (38.0–40.6)
	Not insured	60.1 (52.2–67.9)
	Private insurance	145.5 (139.1–NE)
Positive nodes, n	One node	109.9 (103.5–116.7)	<0.0001
	Two–three nodes or positive aspiration	55.3 (52.1–58.2)
	Four or more nodes or positive nodes documented but number unspecified	23.0 (22.3–24.1)
Immunotherapy	No	60.2 (58.4–62.2)	<0.0001
	Yes	140.4 (132.4–NE)
Charlson–Deyo score	0	85.0 (81.4–88.2)	<0.0001
	1	46.3 (44.1–49.5)
	2 or 3	27.5 (25.0–31.8)

NE: No estimate; NR: Not reached; OS: Overall survival.