Seasonal Influenza (Flu)

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Age Groups

Estimates from the Behavioral Risk Factor Surveillance System (BRFSS), National Immunization Survey (NIS), and the National 2009 H1N1 Flu Survey (NHFS)

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Table of Contents

Table 1 summarizes national weighted estimates of influenza vaccination coverage by age group across several recent influenza seasons. Coverage estimates have been previously published for the 2009-10 influenza season and the 2010-11 season, but estimates for 2007-08 and 2008-09 have not been previously published.

Please note: There have been changes in data sources, time periods, and vaccination recommendations across seasons. The 2009-10 influenza season was unique for several reasons: two vaccines and vaccination periods, and the availability of information for more high risk conditions. Detailed methods are available for the 2009-10 influenza season and the 2010-11 season. For the 2007-08 and 2008-09 BRFSS adult estimates, the same analytic methods were used as for the 2010-11 season estimates just cited.

Additional estimates for 2009-10 vaccination coverage are available in Table 1-B or by selecting the column heading “2009-10 Seasonal (Trivalent)” in Table 1-A.

Table 1-A: Influenza vaccination coverage estimates by age group — United States,* 2007-08 through 2010-11

Age Groups	Estimate^†	2007-08^‡	2008-09^‡	2009-10 Seasonal (Trivalent)^§	2010-11
≥6 months	n			511,357	494,368
	%^\|\|	NA	NA	41.2	43.0
	±95% CI^¶			0.4	0.4
6 months–17 years	n			149,872	116,799
	%	NA	NA	43.7	51.0
	±95% CI			0.9	0.9
≥18 years	n	199,942	342,202	361,485	377,569
	%	37.5	40.5	40.4	40.5
	±95% CI	0.4	0.6	0.4	0.4
18–64 years	n	140,955	235,800	246,461	244,933
	%	30.7	33.6	34.4	34.8
	±95% CI	0.6	0.6	0.4	0.6
18–64 years high-risk^**	n	26,940	46,008	58,368	41,826
	%	44.6	48.4	46.2	46.7
	±95% CI	1.4	1.4	1.0	1.4
18–49 years	n	77,155	123,144	126,708	116,113
	%	25.6	28.4	29.9	30.5
	±95% CI	0.6	0.8	0.5	0.6
18–49 years high-risk^**	n	10,740	17,327	22,233	14,711
	%	36.0	39.1	38.2	39.0
	±95% CI	2.2	2.0	1.3	2.2
50–64 years	n	63,800	112,656	119,754	128,820
	%	43.4	46.2	45.0	44.5
	±95% CI	0.8	0.8	0.6	0.6
≥65 years	n	58,987	106,402	115,018	132,636
	%	72.3	74.0	69.6	66.6
	±95% CI	0.8	0.6	0.6	0.6

* Excludes U.S. territories.

† For 2007-08 and 2008-09, data are from the Behavioral Risk Factor Surveillance System (BRFSS). For 2007-08, coverage estimates represent those interviewed January 2008–June 2008 who reported being vaccinated August 2007–May 2008. For 2008-09, coverage estimates represent those interviewed September 2008–June 2009 who reported being vaccinated August 2008–May 2009. For 2009-10, data are from BRFSS and the National 2009 H1N1 Flu Survey (NHFS). For seasonal influenza vaccination, coverage estimates represent those interviewed October 2009–June 2010 who reported being vaccinated August 2009–May 2010. For more on methods see the Data Source and Methods of the report Final estimates for 2009–10 Seasonal Influenza and Influenza A (H1N1) 2009 Monovalent Vaccination Coverage – United States, August 2009 through May 2010. For 2010-11, data are from BRFSS and the National Immunization Survey (NIS). Coverage estimates represent those interviewed September 2010–June 2011 who reported being vaccinated August 2010–May 2011. For more on methods see the Data Source and Methods of the report Final state-level influenza vaccination coverage estimates for the 2010–11 season–United States, National Immunization Survey and Behavioral Risk Factor Surveillance System, August 2010 through May 2011.

‡ Data for children, 6 months–17 years, not available (NA) for these seasons.

§ Seasonal: Seasonal influenza vaccination (trivalent).

|| Month of vaccination was imputed for respondents with missing month of vaccination data. Percentages are weighted to the non-institutionalized, U.S. civilian population.

¶ CI: Confidence Interval.

** For 2009-10, the selected high risk conditions were asthma, other lung conditions, diabetes, heart disease, kidney conditions, anemia, weakened immune system caused by a chronic illness or by medicines taken for a chronic illness. For 2007-08, 2008-09, and 2010-11, selected high-risk conditions were asthma, diabetes, heart disease.

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Table 1-B: Influenza vaccination coverage estimates by age group — United States,* 2009-10

Age Groups	Estimate^†	Seasonal (Trivalent)^‡	H1N1 (Monovalent)^‡	Seasonal and/or H1N1^‡
≥6 months	n	511,357	453,663	518,465
	%^§	41.2	27.0	47.8
	±95% CI^\|\|	0.4	0.4	0.4
6 months–17 years	n	149,872	146,766	159,971
	%	43.7	40.2	55.3
	±95% CI	0.9	0.8	0.8
≥18 years	n	361,485	306,897	358,494
	%	40.4	22.7	45.4
	±95% CI	0.4	0.4	0.4
18–64 years	n	246,461	209,435	244,165
	%	34.4	21.5	39.8
	±95% CI	0.4	0.5	0.5
18–64 years high-risk^¶	n	58,368	49,772	58,015
	%	46.2	28.5	52.0
	±95% CI	1.0	1.1	1.1
18–49 years	n	126,708	108,009	125,816
	%	29.9	20.7	36.1
	±95% CI	0.5	0.6	0.6
18–49 years high-risk^¶	n	22,233	18,995	22,099
	%	38.2	26.0	45.3
	±95% CI	1.3	1.6	1.6
50–64 years	n	119,754	101,426	118,349
	%	45.0	23.5	48.7
	±95% CI	0.6	0.6	0.6
≥65 years	n	115,018	97,462	114,329
	%	69.6	28.8	72.0
	±95% CI	0.6	0.7	0.5

* Excludes U.S. territories.

† For 2009-10, data are from BRFSS and the National 2009 H1N1 Flu Survey (NHFS). For seasonal influenza vaccination, coverage estimates represent those interviewed October 2009–June 2010 who reported being vaccinated August 2009–May 2010. For influenza A (H1N1) 2009 monovalent vaccination, coverage estimates represent those interviewed November 2009–June 2010 who reported being vaccinated October 2009–May 2010. For more on methods see the Data Source and Methods section of Final estimates for 2009–10 Seasonal Influenza and Influenza A (H1N1) 2009 Monovalent Vaccination Coverage – United States, August 2009 through May, 2010.

‡ H1N1: Influenza A (H1N1) 2009 vaccination (monovalent); Seasonal: Seasonal influenza vaccination (trivalent).

§ Month of vaccination was imputed for respondents with missing month of vaccination data. Percentages are weighted to the non-institutionalized, U.S. civilian population.

|| CI: Confidence Interval.

¶ For 2009-10, the selected high risk conditions were asthma, other lung conditions, diabetes, heart disease, kidney conditions, anemia, weakened immune system caused by a chronic illness or by medicines taken for a chronic illness.

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