Table 1

The numbers of patients with Kawasaki disease and patients with cardiac sequelae due to the disease among the initial onset cases and recurrent cases, by age and sex, 1989–94, Japan

Age		Initial onset case				Recurrent case
Age		Patients	With cardiac sequelae (%)			Patients	With cardiac sequelae (%)
Boys
< 6 months	2357	491 (20.8)		23	6 (26.1)
6–11 months	3628	546 (15.0)		54	14 (25.9)1-150
12–23 months	4902	614 (12.5)		139	32 (23.0)^**
2–4 years	6414	869 (13.5)		291	69 (23.7)^**
5–9 years	1722	296 (17.2)		127	39 (30.7)^**
⩾ 10 years	108	27 (25.0)		7	4 (57.1)^**
Unknown	77	11 (14.3)		3	0
Total	19208	2854 (14.9)		644	164 (25.5)^**
Girls
< 6 months	1669	250 (15.0)		15	2 (13.3)
6–11 months	2319	228 (9.8)		24	4 (16.7)
12–23 months	3401	314 (9.2)		65	11 (16.9)1-150
2–4 years	4786	394 (8.2)		195	27 (13.8)^**
5–9 years	1436	138 (9.6)		100	20 (20.0)^**
⩾ 10 years	70	13 (18.6)		9	2 (22.2)
Unknown	34	4 (11.8)		1	0
Total	13715	1341 (9.8)		409	66 (16.1)^**

↵1-150 p<0.05; ^**p<0.01 (Fisher’s exact test).