Table 1 Estimation of Population-based Incidence of Infantile Intussusception
From: Intussusception among Japanese children: an epidemiologic study using an administrative database
Hospital Volume | No. of hospitals in Japan | No. of beds in Japan (Ni) | No. of beds in DPC participating hospitals (ni) | No. of intussusception from July to December (Xi) | Estimated No. of cases per year (Yi) | |||
|---|---|---|---|---|---|---|---|---|
2007 | 2008 | 2007 | 2008 | 2007 | 2008 | |||
< 400 beds (i = 1) | 7,001 | 566,658 | 138,979 | 119,853 | 86 | 97 | 701 (597-806) | 917 (788-1046) |
400 - < 600 beds (i = 2) | 466 | 175,715 | 98,050 | 89,627 | 176 | 169 | 631 (565-697) | 663 (592-733) |
600 - < 800 beds (i = 3) | 161 | 88,870 | 54,351 | 49,740 | 98 | 78 | 320 (276-365) | 278 (235-322) |
> 800 beds (i = 4) | 95 | 78,995 | 50,245 | 50,245 | 97 | 71 | 305 (262-348) | 223 (187-260) |
Total | 7,723 | 910,238 | 341,625 | 309,465 | 457 | 415 | 1,957 (1743-2216) | 2,081 (1802-2361) |