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Table 2 Estimated counts of influenza-attributable office visits for respiratory (broadly defined), respiratory and cardiorespiratory causes in the United States, 2001–02 through 2008–09

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

  Respiratory (broad) Respiratory Cardiorespiratory
Season Estimate (95 % CI) Estimate (95 % CI) Estimate (95 % CI)
MarketScan Commercial Database, <65 year olds
 2001–02 12,365,184 (11,665,801–13,064,541) 10,475,575 (9,816,954–11,134,170) 10,194,445 (9,522,888–10,866,003)
 2002–03 16,803,325 (15,883,426−17,723,224) 14,701,362 (13,836,458–15,566,240) 14,554,184 (13,664,649–15,443,744)
 2003–04 13,618,103 (12,767,860–14,468,321) 11,354,261 (10,556,090–12,152,431) 11,258,742 (10,426,957–12,090,553)
 2004–05 15,814,272 (15,089,234–16,539,284) 13,605,842 (12,927,419–14,284,264) 13,643,186 (12,922,048–14,364,325)
 2005–06 11,795,968 (11,243,720–12,348,242) 10,071,294 (9,555,005–10,587,610) 10,213,174 (9,660,795–10,765,500)
 2006–07 14,628,435 (13,601,384–15,655,487) 12,634,875 (11,674,057–13,595,718) 12,989,309 (11,977,996–14,000,621)
 2007–08 21,896,301 (20,932,203–22,860,399) 18,921,369 (18,020,955–19,821,782) 19,535,453 (18,554,039–20,516,840)
 2008–09 8,683,598 (8,167,552–9,199,670) 7,535,656 (7,053,640–8,017,619) 7,780,771 (7,262,485–8,299,004)
 Average 14,450,648 12,412,529 12,521,158
 Std dev 3,931,783 3,447,860 3,578,048
MarketScan Medicare Supplemental Database, 65+ year olds
 2006–07 708,335 (354,590–1,062,080) 615,166 (286,572–943,759) 265,729 (0–682,663)
 2007–08 1,078,071 (535,820–1,620,322) 936,707 (432,929–1,440,484) 396,427 (0–1,026,793)
 2008–09 376,923 (185,672–568,173) 327,184 (149,709–504,659) 132,283 (0–343,834)
 Average 721,110 626,352 264,813
 Std dev 350,749 304,915 132,074
  1. <65 years olds: 2001–02 through 2008–09 seasons, MarketScan Commercial Database
  2. 65+ year olds: 2006–09 seasons, MarketScan Medicare Supplemental Database
  3. Std dev = standard deviation, average = mean seasonal estimate
  4. 95 % CI = 95 % confidence intervals