| HR | 95% C.I. | p-value |
---|---|---|---|
Male gender | 0.68 | 0.39 - 1.16 | 0.1 |
Age at switch (each year) | 0.94 | 0.91 - 0.97 | <0.001 |
No. of relapses occurred during the low-dose IFNB regimen | Â | Â | Â |
   0 (*) | Ref. | - | - |
   1 | 3.56 | 1.34 - 8.42 | 0.01 |
   ≥ 2 | 7.89 | 3.10 - 19.85 | <0.001 |
IFNB type (Betaferon or Rebif 44) | 1.14 | 0.52 - 2.51 | 0.7 |