Table 4.

Multivariate analyses for OS^*

Variables:	N	Relative Risk of death (95% CI)	P-value
Main effect:
No rituximab	818	1.00
Rituximab	176	0.74 (0.56 – 0.99)	0.039
Other significant covariates:
Age at transplant, years
<55	568	1.00
≥ 55	426	1.53 (1.29 – 1.83)	<0.001
Disease status at transplant
(1) CR1	168	1.00	<0.001a
(2) PIF-sensitive	184	1.29 (0.91 – 1.82)	0.15
(3) PIF-resistant	54	3.23 (2.14 – 4.87)	<0.001
(4) REL-sensitive	301	2.06 (1.51 – 2.81)	<0.001
(5) REL-resistant	69	2.57 (1.73 – 3.83)	<0.001
(6) CR2+	159	1.58 (1.12 – 2.24)	0.010
(7) Unknown	59	2.27 (1.50 – 3.44)	<0.001
Number of lines of chemotherapy
≤2	564	1.00	<0.001b
>2	422	1.53 (1.28 – 1.82)	<0.001
Year of transplant
1996–1999	735	1.00
2000–2003	259	0.73 (0.57 – 0.94)	0.013

Abbreviations: CI = confidence interval.

^*Cox models stratified on karnofsky performance score

^aSix degrees of freedom

^bTwo degrees of freedom