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Table 2 Proportion of RVGE diagnosed in hospitalized children (ICD10 codes and RV rapid test kits) in Japan during 2008–09

From: The burden of rotavirus gastroenteritis and hospital-acquired rotavirus gastroenteritis among children aged less than 6 years in Japan: a retrospective, multicenter epidemiological survey

Age group Proportion of RVGE among all hospitalizations (n/N; 95% CI) Proportion of RVGE among all acute GE hospitalizations (n/N; 95% CI)* Proportion of hospital-acquired RVGE among RVGE (n/N; 95% CI)
Based on ICD code and kit results Based on kit test results
<2 years 1 4.9% (409/8285; 4.5−5.4) 41.2% (409/993; 38.1−44.3) 55.0% (398/723; 51.3−58.7) 15.2% (62/409; 11.8−19.0)
2−<4years 5.8% (191/3265; 5.1−6.7) 47.6% (191/401; 42.6−52.6) 69.7% (186/267; 63.8−75.1) 7.9% (15/191; 95% CI: 4.5−12.6)
4−<6 years 2.9% (65/2213; 2.3−3.7) 26.0% (65/250; 20.7−31.9) 47.2% (60/127; 38.3−56.3) 6.2% (4/65; 95% CI: 1.7−15.0)
<5 years 2 5.0% (643/12771; 4.7−5.4) 41.7% (643/1542; 39.2−44.2) 58.3% (625/1072; 55.3−61.3) 12.4% (80/643; 10.0−15.2)
<6 years 3 4.8% (665/13767; 4.5−5.2) 40.5% (665/1644; 38.1−42.9) 57.7% (645/1118; 54.7−60.6) 12.2% (81/665; 9.8−14.9)
  1. Note: 1<2 is due to the highest disease burden in this age group; 2<5 is to make it possible to compare with the result from other developed countries; 3<6 years is to align with Japanese schooling system (children start elementary education at the age of 6 years).
  2. *Both indicate the same proportion.