Table 3:

Multivariate Cox proportional hazard model analysis of pharmacokinetic parameters^{^a}

	Hazard Ratio (95% CI)^{^a}	P-value
Model 1: without MGMT methylation status
Baseline median K^trans	1.19 (0.934–1.52)	.158
Posttreatment median K^trans	1.16 (0.958–1.40)	.129
Model 2: with MGMT methylation status
Baseline median K^trans	1.48 (1.12–1.93)	.005
Posttreatment median K^trans	1.01 (0.840–1.21)	.935
Presence of MGMT methylation	0.150 (0.0541–0.417)	<.001
Model 3: by stepwise variable selection^{^b}
Baseline median K^trans	1.49 (1.15–1.92)	.003
Posttreatment median K^trans
Percentage change of kurtosis K^trans	1.26 (0.951–1.66)	.108
Presence of MGMT methylation	0.143 (0.0541–0.375)	<.001

↵a Hazard ratios for K^trans were adjusted for a unit change of 0.001 min⁻¹.
↵b A stepwise variable selection including baseline median K^trans, posttreatment median K^trans, the percentage change of kurtosis K^trans, and the methylation status of MGMT.