Table 2.

Long-term outcomes for 1 unit of red blood cells transfused versus no transfusion, after applying the matching-weights procedure^a

Outcome, RBC units	N	No. with events	HR (95% CI)	P
Overall survivalb				0.338
0	4352	1923	Reference
1	197	121	1.14 (0.88–1.47)
Disease-free survivalb				0.308
0	4352	2240	Reference
1	197	137	1.14 (0.89–1.45)
Recurrencec				0.994
0	4352	1218	Reference
1	197	68	1.00 (0.72–1.40)

CI, confidence interval; HR, hazard ratio; RBC, red blood cell.

^aSee the Methods section for a list of variables included in the matching-weights procedure.

^bCox proportional hazards model

^cCause-specific Cox model