Table 2.

Final survival model of the prognostic score.

Characteristic	Final AFT model
	Coefficient§	SE	AF	p
Intercept	3.2403	0.2046		<0.0001
RTV >10 to ≤20 cm3	−0.4717	0.1905	0.624	0.0133
RTV >20 cm3	−0.7840	0.1498	0.457	<0.0001
Age >50 to ≤70	−0.3057	0.1169	0.734	0.0089
Age >70	−0.4798	0.1624	0.619	0.0031
MGMT, unmethylated	−0.4131	0.0834	0.662	<0.0001
Radiotherapy	0.1512	0.1570	1.170	0.3356
Radiochemotherapy	0.4905	0.1697	1.633	0.0039
Resectability, bad	−0.2272	0.1066	0.797	0.0330
Infiltration of vent. wall	−0.3274	0.0810	0.721	<0.0001
Log(scale)	−0.9845	0.0527		<0.0001
Pseudo R2	0.423
C-index	0.749

RTV, residual tumor volume; MGMT, O⁶-methylguanine-DNA-methyltransferase; AFT, accelerated failure time.

^§ The coefficients in the log-logistic model detect acceleration or deceleration in survival times [acceleration factor (AF)]. The transformation with the exponential function leads to values <1 (delay—disadvantageous) or >1 (acceleration—advantageous). For example, the factor MGMT with exp(−0.4131) = 0.66 is associated with a survival time for unmethylated versus methylated shortened by a factor of 0.66.