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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.