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Table 1 Infection-hospitalization risks based on confirmed hospitalization (cIHR) and on excess hospitalization (eIHR) during the first wave of the 2009 H1N1 pandemic

From: Hospitalization risk of the 2009 H1N1 pandemic cases in Hong Kong

Age Population Infection attack rate* Confirmed Hospitalization cIHR Excess Hospitalization eIHR
   % (95% CI) No. Rate(per 100,000 population) % (95% CI) No. Rate(per 100,000 population) % (95% CI)
0-4 234583 NA   1842 785.2 NA   2067 881.3 NA  
5-14 635423 43.5 (39.6, 48.3) 2445 384.8 0.9 (0.8, 1.0) 2774 436.6 1.0 (0.0, 2.0)
15-29 1410126 16.9 (12.4, 21.3) 1313 93.1 0.6 (0.4, 0.8) 1650 117.0 0.7 (0.2, 1.2)
30-39 1118446 5.8 (3.1, 9.7) 470 42.0 0.7 (0.4, 1.4) 554 49.6 0.9 (-2.2, 3.9)
40-49 1267108 3.8 (1.1, 7.5) 375 29.6 0.8 (0.4, 2.7) 501 39.5 1.0 (-3.6, 5.7)
50-59 1073032 5.0 (2.4, 8.3) 495 46.1 0.9 (0.6, 1.9) 878 81.8 1.6 (-3.3, 6.5)
60+ 1249965 0.8 (0.2, 4.2) 446 35.7 4.5 (0.8, 17.8) 1754 140.3 17.5 (-64.4, 99.4)
  1. Abbreviations: CI confidence interval, NA not available.
  2. * Adapted from ref (4,5).