Preoperative spirometry and BMI in deep inspiration breath-hold radiotherapy: the early detection of cardiac and lung dose predictors without radiation exposure

Table 3 Reference of past similar studies

Authors	Year	Sample size	Objective variable		Pearson's correlation coefficient
Hjelstuen [27]	2015	16, 18 (two cohorts)	MHD LV-FB	LV-FB PFT	− 0.81
Hjelstuen [27]	2015	16, 18 (two cohorts)	MHD LV-FB	LV-FB PFT	0.85
Lee [28]	2016	88	MHD	LV-FB	− 0.59
Cao [14]	2019	67	ΔMHD MLD	ΔLV LV-FB	0.44
Cao [14]	2019	67	ΔMHD MLD	ΔLV LV-FB	0.33
Yamauchi [29]	2020	85	ΔMHD	BMI	0.25
Mkanna [30]	2018	103	ΔMHD	BMI	0.32
Czeremszynska [31]	2017	31	ΔMHD ΔMHD	BMI LV-FB	0.44
Czeremszynska [31]	2017	31	ΔMHD ΔMHD	BMI LV-FB	− 0.58
Browne [32]	2020	31	MHD	BMI	0.51

MHD: mean heart dose, ΔMHD: mean heart dose difference between free-breathing and deep inspiration breath-hold, LV: the lungs volume, LV-FB: the lungs volume on free-breathing CT, ΔLV: LV difference between deep inspiration breath-hold and free-breathing, PFT: pulmonary function test, MLD: mean lung dose, BMI: body mass index, r: correlation coefficient

ISSN: 1748-717X