Table 1. Prevalence and incidence of NMOSD in Korea in 2016 and 2017.

Age, yra	Prevalence (per 100,000 population)						Incidence (per 100,000 population-year)
	2016			2017			2016			2017
	Subtotal	Male	Female	Subtotal	Male	Female	Subtotal	Male	Female	Subtotal	Male	Female
< 15	0.44	0.17	0.73	0.48	0.15	0.84	0.10	0.06	0.15	0.05	0	0.09
15–29	3.07	1.14	5.23	3.12	1.09	5.39	0.51	0.26	0.79	0.27	0.14	0.40
30–44	4.89	2.11	7.79	5.41	2.32	8.63	0.77	0.26	1.30	0.62	0.28	0.96
45–59	4.75	1.55	7.97	5.04	1.65	8.48	1.08	0.46	1.70	0.67	0.30	1.04
≥ 60	2.01	1.12	2.69	2.01	1.12	2.67	0.48	0.27	0.64	0.27	0.17	0.34
Overall	3.36	1.33	5.38	3.56	1.39	5.71	0.65	0.28	1.01	0.41	0.20	0.62

NMOSD = neuromyelitis optica spectrum disorder.

^aAge means the age at which the diagnostic code for NMOSD was entered.