Table 1:

Patient characteristics (n = 41)^{^a}

Characteristic	AQP4 Antibody–Positive Group (n = 15)	AQP4 Antibody–Negative Group (n = 26)
Age (mean) (yr)	48 ± 13	42 ± 12
Female	13 (87%)	5 (19%)
Ethnicity	Asian (100%)	Asian (100%)
Time interval from first attack to MRI study (median) (interquartile range) (days)	10 (3–21)	14 (5–30)
1–15 days	10 (67%)	14 (54%)
16–30 days	3 (20%)	6 (23%)
31–60 days	1 (1%)	2 (8%)
>60 days	1 (1%)	4 (15%)
Brain involvement	8 (53%)	10 (38%)
Preceding optic neuritis	4 (27%)	1 (4%)