Table 1.

Comparison of the demographic data in fellow eye of neuromyelitis optica with unilateral optic neuritis and control groups

Variable	NMO (non-ON eyes) (n=26), n (%)	Control (n=26), n (%)	P
Age (years), median (IQR)	32.5 (12)	28.5 (8)	0.062a
Gender
Male	7 (26.9)	10 (38.5)	0.375b
Female	19 (73.1)	16 (61.5)
Race
Malay	25 (96.2)	22 (84.6)	0.350c
Chinese	1 (3.8)	4 (15.4)
Duration of illness, median (IQR), years	5 (4)	NA	NA
Laterality of the eye
Right	13 (50.0)	26 (100)	<0.001b
Left	13 (50.0)	0 (0)
AQP4-IgG
Positive	21 (80.8)	NA	NA
Negative	5 (19.2)

^aMann–Whitney U-test, ^bChi-square test, ^cFisher’s exact test. NMO=Neuromyelitis optica, NA=Not available, ON=Optic neuritis, IQR=Interquartile range