Table 3. Characteristics of studies.

Study	Year of publica-tion	Design	Country	Total number of patients	Number of VATS patients	Definition of compromised lung function
Berry et al.20	2010	CCS	USA	340	173	FEV1% or DLCO% ≤ 60
Lau et al.4	2010	CCS	UK	84	18	ppoFEV1 <40
Kachare et al.16	2011	CCS	USA	60	47	ppoFEV1% or ppoDLCO%<40
Garzon et al.3	2006	CS	China	25	13	FEV1 <0.8L or FEV1% <50
Paul et al.26	2013	CS	USA	50	18	ppoDLCO% ≤40
Wang et al.22	2013	CS	China	61	61	FEV1% <50

CCS = case-control study, CS = case series, FEV₁ = forced expiratory volume in the first second, DLCO = diffusing capacity of the lung for carbon monoxide, FEV1% = FEV₁ as a percent predicted DLCO% = DLCO as a percent predicted, ppoFEV₁% = predicted postoperative FEV₁ expressed as a percent predicted, ppoDLCO% = predicted postoperative DLCO expressed as a percent predicted.