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Table 4 Estimated counts of influenza-attributable office visits for respiratory disease (broad) in the United States by influenza subtype

From: Model estimates of the burden of outpatient visits attributable to influenza in the United States

  Influenza A/H1N1 Influenza A/H3N2 Influenza B
Season Estimate (95 % CI) Estimate (95 % CI) Estimate (95 % CI)
MarketScan Commercial Database, <65 year olds
 2001–02 244,346 (206,437–282,230) 9,591,775 (8,949,669–10,233,881) 2,529,062 (2,349,650–2,708,475)
 2002–03 4,927,892 (4,226,578–5,629,206) 956,554 (873,630–1,039,452) 10,918,879 (10,010,801–11,826,957)
 2003–04 2253 (1715–2791) 13,208,713 (12,356,831–14,060,570) 407,137 (377,772–436,527)
 2004–05 26,162 (21,539–30,785) 7,662,099 (7,143,927–8,180,245) 8,126,011 (7,568,687–8,683,335)
 2005–06 679,718 (551,518–807,891) 6,668,041 (6,246,233–7,089,875) 4,448,210 (4,124,428–4,771,991)
 2006–07 7,070,007 (5,985,195–8,154,818) 1,809,498 (1,686,185–1,932,810) 5,748,931 (5,289,075–6,208,788)
 2007–08 3,334,887 (2,864,430–3,805,317) 6,838,330 (6,349,764–7,326,895) 11,723,085 (10,930,663–12,515,507)
 2008–09 3,612,374 (3,071,846–4,152,875) 292,933 (273,464–312,428) 4,778,291 (4,434,527–5,122,082)
 Average 2,487,205 5,878,493 6,084,951
 SD 2,658,483 4,539,150 3,940,675
  1. <65 years olds: 2001–02 through 2008–09 seasons, MarketScan Commercial Database
  2. 95 % CI = 95 % confidence intervals, SD = standard deviation of the variability of the attributable burden between seasons, average = mean seasonal estimate