Table 5 Time to relapse if disease started either with ON or MY.

1^st → 2^nd attack^†

   All patients

8.5 months (1-216; N = 138)

n.a.

Patients meeting Wingerchuk's 2006

criteria

9 months (1-216; N = 97)

n.a.

   Seropositives

9 months (1-201; N = 113)

n.s.

   Seronegatives

5 months (1-216; N = 25)

   ON at onset

17 months (1-208; N = 67)

p < 0.002^§

   MY at onset

6 months (1-216; N = 61)

   MY+ON at onset

3.5 months (1-8; N = 10)

   Brainstem encephalitis at onset

5 months (2-20; N = 4)

1^st ON → 2^nd ON

24 months (1-381; 79)

p < 0.0001^§

1^st MY → 2^nd MY

7 months (0-296; 121)

1^st ON → 1^st MY

14 months (0-349; 85)

p < 0.0005^§

1^st MY → 1^st ON

3 months (0-217; 41)