Table 2. NMOSD incidence in younger age groups compared with older age group in 2017.

Age, yra	Male			Female			All
	RR	95% CI	P value	RR	95% CI	P value	RR	95% CI	P value
15–29	0.84	0.30–2.31	0.73	1.19	0.63–2.23	0.60	1.00	0.59–1.71	1.00
30–44	1.68	0.72–3.93	0.22	2.82	1.70–4.69	<0.001	2.32	1.50–3.58	<0.001
45–59	1.78	0.78–4.07	0.16	3.05	1.86–4.99	<0.001	2.51	1.65–3.83	<0.001

NMOSD = neuromyelitis optica spectrum disorder, RR = relative risk, CI = confidence interval.

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