Table 2.

Multivariable analysis with the occurrence of leukopenia as dependent variable.

Variable	OR (95% CI)	p-Value
sc. PEG-IFN-β-1a	7.736 (2.165–27.637)	0.002
Treatment duration	1.020 (0.990–1.052)	0.190
Age at Tx-start	0.996 (0.948–1.047)	0.882
Number of previous therapies	0.499 (0.179–1.393)	0.185
Leukocytes at baseline	0.506 (0.346–0.739)	<0.001

Significant p values are highlighted in bold.

CI, confidence interval; IFN-β, interferon-beta; OR, odds ratio; sc., subcutaneous; Tx, drug treatment.