Table 1

Incidence of NMOSD in China, 2016–2017

	Number of cases	Person-years	Incidence (95% CI, per 100 000 person-years)	IRR (95% CI)
Overall	1313	348 909 063	0.41 (0.39 to 0.43)	–
Race
Han	1133	304 312 130	0.40 (0.38 to 0.42)	0.83 (0.73 to 0.96)
Other	180	44 596 933	0.48 (0.41 to 0.57)	Ref
Sex
Female	1031	156 344 490	0.68 (0.63 to 0.72)	4.52 (4.39 to 4.65)
Male	282	192 564 573	0.15 (0.13 to 0.17)	Ref
Age, years
18–34	260	129 539 892	0.21 (0.19 to 0.24)	Ref
35–44	288	75 659 647	0.39 (0.35 to 0.44)	1.86 (1.69 to 2.02)
45–54	373	70 676 121	0.56 (0.50 to 0.62)	2.65 (2.49 to 2.80)
55–64	234	37 988 761	0.67 (0.58 to 0.76)	3.15 (2.97 to 3.33)
65–74	114	20 836 156	0.61 (0.50 to 0.73)	2.89 (2.66 to 3.11)
75+	44	14 208 486	0.37 (0.26 to 0.50)	1.73 (1.40 to 2.06)