Table A1.

Univariate Cox Proportional Hazards Model of Missing v Determined Marker Data

Marker Data by End Point	Patients		Analysis
	No. of Patients	No. Who Experienced Failure	HR*	95% CI	P†
Overall mortality
Mssing	1,043	565	0.98	0.85 to 1.14	.82
Determined	478	261
Cause-specific mortality
Missing	1,043	146	1.21	0.92 to 1.58	.17
Determined	478	82
Distant metastasis
Missing	1,043	189	1.12	0.92 to 1.49	.20
Determined	478	102

Abbreviation: HR, hazard ratio.

^*A hazard ratio of 1 indicated no difference between the two subgroups. The marker data indicator was coded as follows: 0, missing; 1, determined.

^†P value from χ² test by using the Cox proportional hazards model.