Table 1

Summary of the survey

Primary survey
Northern JapanSouthern JapanP valueTotal
Japanese population in 2011 (×103)17 078110 719127 797
NMO
(category 1)
Number of patients178 (199)1101 (1939)1279 (2093)
Prevalence (/105)1.161.75<0.0011.64
NMOsd
(category 2)
Number of patients68 (193)303 (714)371 (883)
Prevalence (/105)1.130.64<0.0010.69
NMOsd
(category 3)
Number of patients81 (129)341 (887)422 (1031)
Prevalence (/105)0.760.800.0530.81
NMOsd
(category 4)
Number of patients48 (26)207 (384)255 (370)
Prevalence (/105)0.150.35<0.0010.29
TotalNumber of patients375 (547)1952 (3924)2327 (4377)
Prevalence (/105)3.203.54<0.0013.42