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Table 4 Time and number of attacks until the diagnosis of NMO was made by the treating physicians.

From: Contrasting disease patterns in seropositive and seronegative neuromyelitis optica: A multicentre study of 175 patients

 

Time (median, range, N)

p-level

All patients

37.5 months (0-390; 112)

 

ON at onset

MY at onset

55 months (0-390; 66)

16 months (0-255; 29)

P < 0.013§

Isolated ON or MY at onset

Simultaneous ON + MY at onset

49 months (0-390; 94)

1 month (0-18; 13)

P < 0.000001§

Seropositives

Seronegatives

45 months (0-390; 88)

11 months (0-255; 24)

P < 0.029§

 

Number of attacks (median, range, N)

 

ON attacks

MY attacks

1.0 (1-8; 118)

1.0 (1-5; 109)

n.s.§

  1. §Mann Whitney U test. MY = myelitis; N = number of patients (not all data were available from all patients); n.s. = not significant; ON = optic neuritis.