Table 1

Demographic characteristics of South Korea and the incidence of retinitis pigmentosa per 100 000 person-years in the South Korean population (2011–2014)

Age (years)	Number of Koreans			Total			Men			Women			Male-to-female Ratio	p Value (χ² test)
Age (years)	Total	Men	Women	No.	Incidence (95% CI)		No.	Incidence (95% CI)		No.	Incidence (95% CI)		Male-to-female Ratio	p Value (χ² test)
0–4	2 219 084	1 142 220	1 076 864	4	0.05	0.01 to 0.12	4	0.09	0.02 to 0.22	0	No observation		NA	0.05
5–9	2 394 663	1 243 294	1 151 369	21	0.22	0.14 to 0.34	14	0.28	0.15 to 0.47	7	0.15	0.06 to 0.31	1.86	0.18
10–14	3 173 226	1 654 964	1 518 262	28	0.22	0.15 to 0.32	16	0.24	0.14 to 0.39	12	0.20	0.10 to 0.35	1.22	0.60
15–19	3 438 414	1 826 179	1 612 235	123	0.89	0.74 to 1.07	92	1.26	1.02 to 1.54	31	0.48	0.33 to 0.68	2.62	<0.05
20–24	3 055 420	1 625 371	1 430 049	151	1.24	1.05 to 1.45	100	1.54	1.25 to 1.87	51	0.89	0.66 to 1.17	1.73	<0.05
25–29	3 538 949	1 802 805	1 736 144	152	1.07	0.91 to 1.26	84	1.16	0.93 to 1.44	68	0.98	0.76 to 1.24	1.18	0.29
30–34	3 695 348	1 866 397	1 828 951	209	1.41	1.23 to 1.62	112	1.50	1.24 to 1.81	97	1.33	1.08 to 1.62	1.13	0.37
35–39	4 099 147	2 060 233	2 038 914	239	1.46	1.28 to 1.65	129	1.57	1.31 to 1.86	110	1.34	1.10 to 1.61	1.17	0.25
40–44	4 131 423	2 071 431	2 059 992	307	1.86	1.66 to 2.08	162	1.96	1.67 to 2.28	145	1.76	1.48 to 2.07	1.11	0.36
45–49	4 073 358	2 044 641	2 028 717	304	1.87	1.66 to 2.09	148	1.81	1.53 to 2.13	156	1.92	1.63 to 2.25	0.94	0.60
50–54	3 798 131	1 887 973	1 910 158	405	2.67	2.41 to 2.94	204	2.70	2.34 to 3.10	201	2.63	2.28 to 3.02	1.03	0.79
55–59	2 766 695	1 360 747	1 405 948	327	2.95	2.64 to 3.29	150	2.76	2.33 to 3.23	177	3.15	2.70 to 3.65	0.88	0.23
60–64	2 182 236	1 057 035	1 125 201	283	3.24	2.88 to 3.64	127	3.00	2.50 to 3.57	156	3.47	2.94 to 4.05	0.86	0.23
65–69	1 812 168	833 242	978 926	236	3.26	2.85 to 3.70	85	2.55	2.04 to 3.15	151	3.86	3.27 to 4.52	0.66	<0.05
70–74	1 566 014	672 894	893 120	178	2.84	2.44 to 3.29	72	2.68	2.09 to 3.37	106	2.97	2.43 to 3.59	0.90	0.50
75–79	1 084 367	410 726	673 641	108	2.49	2.04 to 3.01	49	2.98	2.21 to 3.94	59	2.19	1.67 to 2.82	1.36	0.11
80–84	595 509	186 008	409 501	56	2.35	1.78 to 3.05	13	1.75	0.93 to 2.99	43	2.63	1.90 to 3.54	0.67	0.20
≥85	366 609	94 736	271 873	13	0.89	0.47 to 1.52	6	1.58	0.58 to 3.45	7	0.64	0.26 to 1.33	2.45	0.09
Total	47 990 761	23 840 896	24 149 865	3144	1.64	1.58 to 1.70	1567	1.64	1.56 to 1.73	1577	1.63	1.55 to 1.72	1.01	0.86

The population of Korea was based on the 2010 census from the Korean Statistical Information Service. NA, not available.