. 2017 Nov 16;143(11):1111–1116. doi: 10.1001/jamaoto.2017.1694

Table 2. Cox regression Models Comparing Hazard of Mortality by Percent of Cases With Lymph Node Yields of 18 or More^a.

Lymph Node ≥18 Threshold, %	Hospitals, No.	Patients, No.	HR (95% CI)	P Value
70	395	38 830	0.98 (0.95-1.01)	.23
75	290	31 819	0.97 (0.94-1.00)	.03
80	199	23 336	0.951 (0.92-0.98)	.001
85	118	12 877	0.927 (0.89-0.96)	<.001
90	47	3101	0.91 (0.85-0.97)	.005

Abbreviation: HR, hazard ratio.

^{^a}

Model includes sex, age, race, comorbidities, site, cN stage, pT stage, number of positive nodes, receipt of adjuvant therapy, extracapsular extension, insurance, income, education level, hospital volume, and hospital type. Head and neck cancers; data from the National Cancer Database, 2004 to 2013.

Table 2. Cox regression Models Comparing Hazard of Mortality by Percent of Cases With Lymph Node Yields of 18 or Morea.

Table 2. Cox regression Models Comparing Hazard of Mortality by Percent of Cases With Lymph Node Yields of 18 or More^a.