Table 1.

Characteristics of mumps cases during the three periods in the Republic of Korea: low (2001–2006), intermediate (2007–2012), and high endemicity (2013–2015)

	2001–2003		2004–2006		2007–2009		2010–2012		2013–2015
Variable	N	(%)	N	(%)	N	(%)	N	(%)	N	(%)
Total cases	3950		5696		15 498		19 723		65 758
Age group (years)
0–5	897	(22·7)	895	(15·7)	1928	(12·4)	3136	(15·9)	9304	(14·1)
6–11	1819	(46·1)	1721	(30·2)	4153	(26·8)	4895	(24·8)	12 504	(19·0)
12–14	717	(18·2)	1471	(25·8)	2799	(18·1)	3537	(17·9)	12 105	(18·4)
15–17	361	(9·1)	1298	(22·8)	5033	(32·5)	5117	(25·9)	20 036	(30·5)
⩾18	156	(3·9)	311	(5·5)	1585	(10·2)	3038	(15·4)	11 809	(18·0)
Gender
Female	1463	(37·0)	1915	(33·6)	5081	(32·8)	6486	(32·9)	22 281	(33·9)
Male	2487	(63·0)	3781	(66·4)	10 417	(67·2)	13 237	(67·1)	43 477	(66·1)
Geographic area
Seoul-Incheon-Gyeonggi	2076	(52·6)	3196	(56·1)	8169	(52·7)	9487	(48·1)	21 659	(32·9)
Daejeon-Chungcheong	336	(8·5)	621	(10·9)	1046	(6·7)	2506	(12·7)	5935	(9·0)
Gwangju-Jeolla	469	(11·9)	191	(3·4)	680	(4·4)	974	(4·9)	16 467	(25·0)
Gangwon	150	(3·8)	321	(5·6)	537	(3·5)	823	(4·2)	2309	(3·5)
Daegu-Gyeongbuk	451	(11·4)	504	(8·8)	3668	(23·7)	1268	(6·4)	4492	(6·8)
Busan-Ulsan-Gyeongnam	327	(8·3)	768	(13·5)	1319	(8·5)	3471	(17·6)	13 694	(20·8)
Jeju	141	(3·6)	95	(1·7)	79	(0·5)	1194	(6·1)	1202	(1·8)
Seasonality
Winter Break (January–February)	316	(8·0)	408	(7·2)	970	(6·3)	1703	(8·6)	6725	(10·2)
First Semester (March–July)	2357	(59·7)	2903	(51·0)	9003	(58·1)	9152	(46·4)	28 220	(42·9)
Summer Break (August)	220	(5·6)	349	(6·1)	931	(6·0)	1291	(6·5)	4176	(6·4)
Second Semester (September–December)	1057	(26·8)	2026	(35·6)	4594	(29·6)	7577	(38·4)	26 337	(40·1)