. Author manuscript; available in PMC: 2020 Jan 1.

Published in final edited form as: J Thorac Cardiovasc Surg. 2018 Sep 15;157(1):362–373.e8. doi: 10.1016/j.jtcvs.2018.08.075

Table 2.

Summary of covariates used for propensity score matching in comparative studies on stereotactic body radiation therapy versus surgical resection for early-stage non-small cell lung cancer

Study	Patient Characteristics							Pre-Operative Risk Factors							Tumor Characteristics
	Age	Sex	Race	Education	Income	Insurance	Geography	CCI	ACE	PS	DI	PFT	O₂ Use	Home Services	Size	Stage	Location	Histology	PET
Paul¹⁴	●	●	●		●		●				●				●	●		●	●
Smith¹⁵	●	●	●					●		●			●			●			●
Ezer¹⁶	●	●	●		●			●						●	●	●	●	●	●
Yu¹⁷	●	●	●		●		●				●								●
Shirvani¹⁸	●	●						●		●			●		●	●			●
Rosen²¹	●	●	●	●	●	●	●	●							●	●	●	●
Puri²²	●	●	●		●		●	●							●	●
Boyer²³	●		●				●	●				●				●		●
Crabtree²⁵	●								●			●			●	●	●
Robinson²⁶																●
Port²⁹	●	●																●
Cornwell³¹		●						●				●
Varlotto³²	●	●						●							●			●
Kastelijn³⁴	●	●								●		●			●	●
Verstegen³⁵	●	●						●		●		●			●	●	●	●
Palma³⁹	●	●														●
Miyazaki⁴⁰	●	●						●		●		●			●
Hamaji⁴¹	●	●						●				●			●
Wang⁴⁴	●	●						●		●		●				●	●

ACE, adult comorbidity evaluation; CCI, Charlson comorbidity index; DI, disability index; PET, pre-treatment position-emission; PFT, pulmonary function tests; PS, performance status; tomography.