2013-14 NHIS, BRFSS, and NIS-Flu Influenza Data
The National Health Interview Survey (NHIS) is the data source used to monitor Healthy People 2020 objectives for influenza vaccination (IID-12.11-13)External. Influenza vaccination coverage estimates nationally and by state and selected local area from NIS-Flu and BRFSS are available each season approximately eleven months before final national estimates from NHIS. A comparison of national estimates from NIS-Flu and BRFSS to NHIS is available below for the 2013-14 season. Additional information on methods is available at Surveillance of Influenza Vaccination Coverage — United States, 2007–08 Through 2011–12 Influenza Seasons.
|Total||Change from 2012-13|| to 2013-14 influenza season
|Surveillance System||Unweighted Sample Size||%§||95% CI||%||95% CI||%||95% CI§||%||95% CI||%||95% CI|
|6 months-17 years||8,501||51.8||±2.0||1.3||49.5||±2.9||52.5||±5.3||54.0||±4.3||57.6||±5.3|
|6 months-17 years||126,860||58.9||±0.8||2.3||55.2||±0.9||57.2||±2.2||66.0||±2.1||64.9||±2.1|
|Difference Percent Vaccinated, NIS-Flu -NHIS|
|6 months-17 years||7.1¶||±2.2||5.7¶||±3.0||4.7||±5.7||12.0¶||±4.8||7.3¶||±5.7|
Abbreviation: CI = Confidence Interval
* Estimates of the percentage of people vaccinated are based on interviews conducted beginning September (NHIS) or October (NIS-Flu) 2013 through June 2014 and reported vaccinations from July 2013 through May 2014.
† Race/ethnicity is based on parental report. Persons categorized as white, black, or other were identified as non-Hispanic. Persons identified as Hispanic might be of any race. The other race category includes Asian, American Indian/Alaska Native (AI/AN), and multiple races.
‡ Excludes U.S. territories.
§ Percentage vaccinated. Percentages are weighted to the non-institutionalized, U.S. civilian population. Month of vaccination was imputed for respondents with missing month of vaccination data (n= 710 [11.7.7%] in NHIS, n= 10,049 [7.7%] in NIS-Flu).
|| Estimates of the percentage of people vaccinated based on interviews conducted September (NHIS) or October (NIS-Flu) 2012 through June 2013 and reported vaccinations from August 2012 through May 2013.
¶ Statistically significant difference between the 2013-14 NIS-Flu and the 2013-14 NHIS season by t-test (p<0.05).
|Total||Change from 2012-13¶ to 2013-14 influenza season
|Surveillance System||Unweighted Sample Size||%||||95% CI||%||95% CI||%||95% CI||%||95% CI||%||95% CI|
|18-64 years with high-risk conditions||4,674||47.3||±2.4||-2.2||48.9||±2.9||42.9||±5.5||40.8||±5.7||53.8||±9.2|
|18-64 years without high-risk conditions||18,201||33.9||±1.4||1.0||36.2||±1.8||30.0||±2.7||27.4||±2.7||36.3||±4.1|
|18-49 years with high-risk conditions||2,138||37.6||±3.3||-1.4||38.4||±4.3||36.0||±8.0||31.6||±7.4||47.9||±14.1|
|18-49 years without high-risk conditions||13,108||30.3||±1.6||1.0||31.6||±2.2||29.0||±3.1||26.1||±3.1||33.3||±4.1|
|18-64 years with high-risk conditions||60,603||46.3||±1.0||0.9||48.5||±1.2||40.2||±3.1||41.5||±3.1||48.4||±5.7|
|18-64 years without high-risk conditions||170,313||33.9||±0.6||1.0||36.0||±0.6||29.3||±1.8||28.0||±1.6||35.4||±2.4|
|18-49 years with high-risk conditions||21,198||38.7||±1.8||0.6||40.2||±2.0||34.0||±4.9||34.4||±4.1||46.5||±8.8|
|18-49 years without high-risk conditions||97,005||31.1||±0.8||1.3||32.6||±0.8||28.2||±2.2||26.8||±1.8||34.2||±2.5|
|Difference in percent vaccinated, BRFSS – NHIS|
|18-64 years with high-risk conditions||-1.0||±2.6||-0.4||±3.1||-2.7||±6.3||0.7||±6.5||-5.4||±10.8|
|18-64 years without high-risk conditions||0.0||±1.5||-0.2||±1.9||-0.7||±3.2||0.6||±3.1||-0.9||±4.8|
|18-49 years with high-risk conditions||1.1||±3.8||1.8||±4.7||-2.0||±9.4||2.8||±8.5||-1.4||±16.6|
|18-49 years without high-risk conditions||0.8||±1.8||1.0||±2.3||-0.8||±3.8||0.7||±3.6||0.9||±4.8|
Abbreviation: CI = Confidence Interval
* Estimates of the percentage of people vaccinated are based on interviews conducted beginning September 2013 through June 2014 and reported vaccinations from July 2013 through May 2014.
† High-risk definition based on the NHIS: adults categorized as at high risk for influenza-related complications self-reported one or more of the following: (1) ever being told by a physician they had diabetes, emphysema, chronic obstructive pulmonary disease, coronary heart disease, angina, heart attack, or other heart condition; (2) having a diagnosis of cancer during the preceding 12 months (excluding nonmelanoma skin cancer) or ever being told by a physician they have lymphoma, leukemia, or blood cancer during the previous 12 months; (3) being told by a physician they have chronic bronchitis or weak or failing kidneys; or (4) reporting an asthma episode or attack during the preceding 12 months. High-risk definition based on the BRFSS: adults categorized as at high risk for influenza-related complications self-reported diabetes, asthma, myocardial infarction, coronary heart disease, chronic obstructive pulmonary disease (COPD), or cancer (excluding skin cancer).
‡ Race/ethnicity is based on self report. Persons categorized as white, black, or other were identified as non-Hispanic. Persons identified as Hispanic might be of any race. The other race category includes Asian, American Indian/Alaska Native (AI/AN), and multiple races.
§ Excludes U.S. territories.
|| Percentage vaccinated. Percentages are weighted to the non-institutionalized, U.S. civilian population. Month of vaccination was imputed for respondents with missing month of vaccination data (n= 503 [3.1%] in NHIS, n= 11,387 [6.8%] in BRFSS).
¶ Estimates of the percentage of people vaccinated based on interviews conducted September 2012 through June 2013 and reported vaccinations from August 2012 through May 2013.
** Statistically significant difference between the 2013-14 BRFSS and the 2013-14 NHIS season by t-test (p<0.05).