2015-16 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 icon. 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 2015-16 season. Additional information on methods is available at Surveillance of Influenza Vaccination Coverage — United States, 2007–08 Through 2011–12 Influenza Seasons.
2014-15|| to 2015-16
|%§||95% CI||%||95% CI||%||95% CI||%||95% CI||%||95% CI|
|6 months-17 years||7,325||51.8||±2.0||-1.3||47.7||±2.5||52.6||±5.3||55.2||±4.5||62.8||±5.1|
|6 months-17 years||126,846||59.3||±0.8||0.0||55.3||±0.9||60.9||±2.1||64.7||±2.0||64.8||±2.4|
|Difference percent vaccinated, NIS-Flu – NHIS|
|6 months-17 years||7.5¶||±2.2||7.6¶||±2.7||8.3¶||±5.7||9.5¶||±4.9||2.0||±5.6|
Abbreviation: CI = Confidence Interval
* Estimates of the percentage of people vaccinated are based on interviews conducted beginning September (NHIS) or October (NIS-Flu) 2015 through June 2016 and reported vaccinations from July 2015 through May 2016.
† 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= 585 [11.5%] in NHIS, n= 13,767 [18.2%] in NIS-Flu).
|| Estimates of the percentage of people vaccinated based on interviews conducted September (NHIS) or October (NIS-Flu) 2014 through June 2015 and reported vaccinations from July 2014 through May 2015.
¶ Statistically significant difference between the 2015-16 NIS-Flu and the 2015-16 NHIS season by t-test (p<0.05).
|%||||95% CI||%||95% CI||%||95% CI||%||95% CI||%||95% CI|
|18-64 years with high-risk conditions||3,937||48.2||±2.5||2.2||47.9||±2.9||50.5||±7.6||47.2||±7.6||49.0||±10.6|
|18-64 years without high-risk conditions||15,319||34.2||±1.4||-1.6||35.7||±1.6||32.4||±4.1||27.4||±3.7||40.3||±4.5|
|18-49 years with high-risk conditions||1,729||37.1||±3.7||1.3||37.6||±4.3||40.1||±10.4||35.8||±11.8||33.8||±11.4|
|18-49 years without high-risk conditions||10,750||31.5||±1.6||-0.6||32.3||±2.0||30.9||±4.9||27.1||±4.1||37.1||±4.9|
|18-64 years with high-risk conditions||53,798||46.0||±1.2||-1.6||47.4||±1.2||42.3||±3.1||42.3||±4.3||48.2||±6.3|
|18-64 years without high-risk conditions||149,939||33.5||±0.6||-1.8||35.1||±0.6||29.9||±2.0||29.7||±2.2||36.0||±2.4|
|18-49 years with high-risk conditions||18,662||39.5||±2.0||0.2||40.0||±2.2||37.1||±4.9||37.6||±5.9||42.7||±9.4|
|18-49 years without high-risk conditions||86,111||31.5||±0.8||-1.1||32.5||±0.8||28.7||±2.4||28.8||±2.4||35.5||±2.7|
|Difference in percent vaccinated, BRFSS-NHIS|
|18-64 years with high-risk conditions||-2.2||±2.8||-0.5||±3.1||-8.2||±8.2||-4.9||±8.7||-0.8||±11.8|
|18-64 years without high-risk conditions||-0.7||±1.5||-0.6||±1.7||-2.5||±4.6||2.3||±4.3||-4.3||±5.1|
|18-49 years with high-risk conditions||2.4||±4.2||2.4||±4.8||-3.0||±11.1||1.8||±12.5||8.9||±14.8|
|18-49 years without high-risk conditions||0.0||±1.8||0.2||±2.2||-2.2||±5.5||1.7||±4.8||-1.6||±5.6|
Abbreviation: CI = Confidence Interval
* Estimates of the percentage of people vaccinated are based on interviews conducted beginning September 2015 through June 2016 and reported vaccinations from July 2015 through May 2016.
† 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). Because data on high risk status may be missing for some adults in both NHIS and BRFSS, the sample sizes for the high risk categories for the various age groups may not add up to the total sample size for that age group.
‡ 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. population. Month of vaccination was imputed for respondents with missing month of vaccination data (n= 550 [3.8%] in NHIS, n= 9,995 [6.7%] in BRFSS).
¶ Estimates of the percentage of people vaccinated based on interviews conducted September 2014 through June 2015 and reported vaccinations from July 2014 through May 2015.
** Statistically significant difference between the 2015-16 BRFSS and the 2015-16 NHIS season by t-test (p<0.05).