Table 1.

Logistic Regression Model for Propensity Score

Parameter	Estimate	P
Intercept	−1.90	.35
Age	0.016	.62
Sex
Male	0.00
Female	−0.90	.16
ECOG performance status
0	0.00
1	1.09	.12
2	1.07	.36
Stage
II to III	0.00
IV	0.44	.46

Abbreviation: ECOG, Eastern Cooperative Oncology Group.