Table 2. Prevalence of myasthenia gravis (per 100,000 persons).

Year	Age (years)	Crude prevalence			Standardized prevalence*
		Subtotal	Male	Female	Subtotal	Male	Female
2010	≤19	322	140	182	2.84	2.36	3.36
	20–39	1,196	444	752	7.98	5.76	10.34
	40–59	2,117	824	1,293	12.93	9.94	16.00
	60–69	744	310	434	17.64	15.35	19.75
	70–79	441	143	298	15.91	12.47	18.35
	≥80	87	24	63	8.43	8.02	8.60
	Total	4,907	1,885	3,022	9.67	7.42	11.93
2011	≤19	329	137	192	2.90	2.31	3.54
	20–39	1,281	494	787	8.55	6.41	10.83
	40–59	2,329	908	1,421	14.22	10.95	17.58
	60–69	847	347	500	20.09	17.18	22.76
	70–79	506	162	344	18.26	14.12	21.18
	≥80	118	36	82	11.43	12.02	11.19
	Total	5,410	2,084	3,326	10.66	8.20	13.13

^*The overall standardized number per 100,000 persons was calculated using the standard population data for 2011 from the Korean Statistical Information Service in the Korea National Statistical Office.