Table 3. Hazard ratio for baseline ETV, absolute ETV change and ETV% with and without MR bias field correction.

Variables	Without MR bias field correction			With MR bias field correction
	Hazard ratio (95% CI)	P		Hazard ratio (95% CI)	P
Baseline ETV	1.061 (1.029, 1.093)	<0.001		1.161 (1.066, 1.265)	<0.001
Absolute ETV change	1.010 (0.982, 1.039)	0.49		1.038 (0.932, 1.157)	0.50
ETV%	1.003 (0.979, 1.028)	0.79		0.663 (0.535, 0.822)	<0.001

Main findings:•Both baseline ETV and ETV% are factors related to prognosis for MR bias field corrected images, whereas only baseline ETV was a prognostic factor for images without MR bias field correction.•With MR bias field correction, when baseline ETV increased by 100 cm³, the mortality rate increased by about 16%.•With MR bias field correction, when ETV% decreased by 10%, the mortality rate decreased by about 34%.