Table 2.

Multivariate Cox regression analysis for TTFT

Items	β	P	HR	95% CI
Rai staging system	0.582	0.002	1.8	1.2–2.6
U-IGHV	0.525	0.049	1.7	1.0–2.9
Elevated LDH	0.110	0.690	1.1	0.7–1.9
del11q	0.341	0.286	1.4	0.8–2.6
del17p >20%	0.662	0.050	1.9	1.0–3.8

TTFT: Time to first treatment; HR: Hazard ratio; CI: Confidence interval; IGHV: Immunoglobulin heavy chain variable region; LDH: Lactate dehydrogenase; U: Unmutated.