2014-15 NHIS, BRFSS, and NIS-Flu Influenza Data
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The National Health Interview Survey (NHIS) is the data source used to monitor Healthy People 2020 objectives for influenza vaccination (IID-12.11-13). 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 2014-15 season. Additional information on methods is available at Surveillance of Influenza Vaccination Coverage — United States, 2007–08 Through 2011–12 Influenza Seasons.
Table 1. Influenza vaccination coverage* by age group and race/ethnicity†, children 6 months through 17 years, National Health Interview Survey (NHIS) and National Immunization Survey-Flu (NIS-Flu), United States,‡ 2014-15 influenza season
| Total | Change from 2013-14|| to 2014-15 influenza season (percentage points) |
White only, non-Hispanic |
Black only, non-Hispanic |
Hispanic | Other, non-Hispanic |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Surveillance System | Unweighted Sample Size | %§ | 95% CI | % | 95% CI | % | 95% CI§ | % | 95% CI | % | 95% CI | |
| NHIS | ||||||||||||
| Age Group | ||||||||||||
| 6 months-17 years | 8,574 | 53.1 | ±2.0 | 1.3 | 51.4 | ±2.7 | 50.5 | ±4.9 | 54.2 | ±3.3 | 63.6 | ±6.7 |
| 6-23 months | 803 | 66.4 | ±6.1 | 2.9 | 69.6 | ±10.6 | 51.2 | ±16.3 | 64.9 | ±10.2 | 76.9 | ±16.9 |
| 2-4 years | 1,449 | 57.8 | ±4.3 | 0.3 | 56.1 | ±5.5 | 57.5 | ±12.0 | 57.9 | ±9.0 | 66.8 | ±11.6 |
| 5-12 years | 3,690 | 55.4 | ±2.7 | 3.4 | 54.7 | ±3.9 | 52.8 | ±8.4 | 55.4 | ±4.9 | 64.5 | ±7.6 |
| 13-17 years | 2,632 | 41.8 | ±3.3 | -0.2 | 38.9 | ±4.1 | 43.2 | ±9.0 | 45.1 | ±5.7 | 51.1 | ±15.7 |
| NIS-Flu | ||||||||||||
| Age Group | ||||||||||||
| 6 months-17 years | 128,143 | 59.3 | ±0.8 | 0.4 | 56.0 | ±0.9 | 58.3 | ±2.5 | 64.2 | ±1.8 | 66.0 | ±2.3 |
| 6-23 months | 14,126 | 74.6 | ±1.9 | 0.3 | 73.2 | ±2.3 | 68.9 | ±6.4 | 79.0 | ±4.4 | 77.0 | ±4.4 |
| 2-4 years | 23,500 | 67.8 | ±1.7 | -0.3 | 64.7 | ±2.1 | 68.1 | ±5.5 | 71.1 | ±3.9 | 73.7 | ±4.7 |
| 5-12 years | 59,075 | 61.8 | ±1.1 | 0.8 | 57.9 | ±1.3 | 60.2 | ±3.2 | 68.1 | ±2.4 | 69.0 | ±3.3 |
| 13-17 years | 31,442 | 46.6 | ±1.4 | 0.2 | 44.7 | ±1.7 | 47.2 | ±4.3 | 49.4 | ±3.5 | 51.1 | ±4.9 |
| Difference Percent Vaccinated, NIS-Flu -NHIS | ||||||||||||
| Age Group | ||||||||||||
| 6 months-17 years | 6.2¶ | ±2.2 | 4.6¶ | ±2.8 | 7.8¶ | ±5.5 | 10.0¶ | ±3.8 | 2.4 | ±7.1 | ||
| 6-23 months | 8.2¶ | ±6.4 | 3.6 | ±10.8 | 17.7¶ | ±17.5 | 14.1¶ | ±11.1 | 0.1 | ±17.5 | ||
| 2-4 years | 10.0¶ | ±4.6 | 8.6¶ | ±5.9 | 10.6 | ±13.2 | 13.2¶ | ±9.8 | 6.9 | ±12.5 | ||
| 5-12 years | 6.4¶ | ±2.9 | 3.2 | ±4.1 | 7.4 | ±9.0 | 12.7¶ | ±5.5 | 4.5 | ±8.3 | ||
| 13-17 years | 4.8¶ | ±3.6 | 5.8¶ | ±4.4 | 4.0 | ±10.0 | 4.3 | ±6.7 | 0.0 | ±16.4 | ||
Abbreviation: CI = Confidence Interval
* Estimates of the percentage of people vaccinated are based on interviews conducted beginning September (NHIS) or October (NIS-Flu) 2014 through June 2015 and reported vaccinations from July 2014 through May 2015.
† 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= 622 [11.0%] in NHIS, n= 13,057 [18.9%] in NIS-Flu).
|| Estimates of the percentage of people vaccinated based on interviews conducted September (NHIS) or October (NIS-Flu) 2013 through June 2014 and reported vaccinations from July 2013 through May 2014.
¶ Statistically significant difference between the 2014-15 NIS-Flu and the 2014-15 NHIS season by t-test (p<0.05).
Table 2. Influenza vaccination coverage* by age group, high-risk status,† and race/ethnicity‡, adults 18 years and older, Behavioral Risk Factor Surveillance System (BRFSS) and National Health Interview Survey (NHIS) United States,§ 2014-15 influenza season
| Total | Change from 2013-14¶ to 2014-15 influenza season (percentage points) |
White only, non-Hispanic |
Black only, non-Hispanic |
Hispanic | Other, non-Hispanic |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Surveillance System | Unweighted Sample Size | %|| | 95% CI | % | 95% CI | % | 95% CI | % | 95% CI | % | 95% CI | |
| NHIS | ||||||||||||
| Age Group | ||||||||||||
| ≥18 years | 29,195 | 44.6 | ±1.0 | 1.6 | 48.2 | ±1.4 | 37.7 | ±2.5 | 33.3 | ±2.2 | 47.3 | ±3.7 |
| 18-64 years | 22,106 | 37.7 | ±1.0 | 1.2 | 40.1 | ±1.4 | 33.1 | ±2.5 | 29.9 | ±2.2 | 42.4 | ±4.1 |
| 18-64 years at high risk | 4,439 | 46.0 | ±2.5 | -1.3 | 47.7 | ±3.3 | 43.6 | ±6.1 | 42.7 | ±5.9 | 40.3 | ±9.2 |
| 18-64 years not at high risk | 17,621 | 35.8 | ±1.2 | 1.9 | 38.4 | ±1.6 | 30.1 | ±2.7 | 27.1 | ±2.5 | 42.7 | ±4.3 |
| 18-49 years | 14,621 | 32.6 | ±1.4 | 1.2 | 34.4 | ±1.8 | 29.4 | ±3.1 | 25.8 | ±2.5 | 39.9 | ±4.7 |
| 18-49 years at high risk | 2,004 | 35.8 | ±3.3 | -1.8 | 36.8 | ±4.5 | 36.2 | ±8.8 | 33.3 | ±7.3 | 34.2 | ±13.3 |
| 18-49 years not at high risk | 12,596 | 32.1 | ±1.6 | 1.8 | 34.1 | ±2.0 | 28.3 | ±3.3 | 24.6 | ±2.7 | 40.5 | ±4.9 |
| 50-64 years | 7,485 | 48.7 | ±2.2 | 1.0 | 50.2 | ±2.5 | 41.9 | ±4.7 | 44.9 | ±7.1 | 50.0 | ±8.4 |
| ≥65 years | 7,089 | 73.5 | ±1.8 | 2.0 | 75.1 | ±2.0 | 64.4 | ±6.3 | 64.1 | ±6.3 | 81.5 | ±9.0 |
| BRFSS | ||||||||||||
| Age Group | ||||||||||||
| ≥18 years | 323,215 | 43.6 | ±0.4 | 1.4 | 46.7 | ±0.6 | 38.7 | ±1.6 | 35.0 | ±1.8 | 41.3 | ±2.2 |
| 18-64 years | 208,124 | 38.0 | ±0.6 | 1.3 | 40.0 | ±0.6 | 35.1 | ±1.8 | 32.5 | ±2.0 | 38.2 | ±2.4 |
| 18-64 years at high risk | 53,795 | 47.6 | ±1.2 | 1.3 | 48.5 | ±1.2 | 46.0 | ±3.5 | 45.2 | ±4.7 | 46.8 | ±5.1 |
| 18-64 years not at high risk | 152,107 | 35.3 | ±0.6 | 1.4 | 37.6 | ±0.6 | 31.0 | ±1.8 | 29.8 | ±2.2 | 36.2 | ±2.7 |
| 18-49 years | 105,619 | 33.5 | ±0.8 | 1.2 | 35.1 | ±0.8 | 30.6 | ±2.0 | 29.9 | ±2.2 | 35.6 | ±2.7 |
| 18-49 years at high risk | 18,269 | 39.3 | ±1.8 | 0.6 | 39.1 | ±2.0 | 40.4 | ±5.1 | 38.5 | ±5.7 | 39.3 | ±6.1 |
| 18-49 years not at high risk | 86,101 | 32.6 | ±0.8 | 1.5 | 34.5 | ±0.8 | 28.1 | ±2.2 | 28.8 | ±2.4 | 35.0 | ±3.1 |
| 50-64 years | 102,505 | 47.0 | ±0.8 | 1.7 | 47.7 | ±0.8 | 45.2 | ±2.9 | 42.6 | ±4.3 | 48.1 | ±4.9 |
| ≥65 years | 115,091 | 66.7 | ±0.8 | 1.7 | 67.5 | ±0.8 | 59.8 | ±2.9 | 65.3 | ±4.7 | 68.2 | ±4.3 |
| Difference in percent vaccinated, BRFSS – NHIS | ||||||||||||
| Age Group | ||||||||||||
| ≥18 years | -1.0 | ±1.1 | -1.5 | ±1.5 | 1.0 | ±3.0 | 1.7 | ±2.8 | -6.0** | ±4.3 | ||
| 18-64 years | 0.3 | ±1.2 | -0.1 | ±1.5 | 2.0 | ±3.1 | 2.6 | ±3.0 | -4.2 | ±4.8 | ||
| 18-64 years at high risk | 1.6 | ±2.8 | 0.8 | ±3.5 | 2.4 | ±7.0 | 2.5 | ±7.5 | 6.5 | ±10.5 | ||
| 18-64 years not at high risk | -0.5 | ±1.3 | -0.8 | ±1.7 | 0.9 | ±3.2 | 2.7 | ±3.3 | -6.5** | ±5.1 | ||
| 18-49 years | 0.9 | ±1.6 | 0.7 | ±2.0 | 1.2 | ±3.7 | 4.1** | ±3.3 | -4.3 | ±5.4 | ||
| 18-49 years at high risk | 3.5 | ±3.8 | 2.3 | ±4.9 | 4.2 | ±10.2 | 5.2 | ±9.3 | 5.1 | ±14.6 | ||
| 18-49 years not at high risk | 0.5 | ±1.8 | 0.4 | ±2.2 | -0.2 | ±4.0 | 4.2** | ±3.6 | -5.5 | ±5.8 | ||
| 50-64 years | -1.7 | ±2.3 | -2.5 | ±2.6 | 3.3 | ±5.5 | -2.3 | ±8.3 | -1.9 | ±9.7 | ||
| ≥65 years | -6.8** | ±2.0 | -7.6** | ±2.2 | -4.6 | ±6.9 | 1.2 | ±7.9 | -13.3** | ±10.0 | ||
Abbreviation: CI = Confidence Interval
* Estimates of the percentage of people vaccinated are based on interviews conducted beginning September 2014 through June 2015 and reported vaccinations from July 2014 through May 2015.
† 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. population. Month of vaccination was imputed for respondents with missing month of vaccination data (n= 520 [3.5%] in NHIS, n= 9,892 [6.3%] in BRFSS).
¶ Estimates of the percentage of people vaccinated based on interviews conducted September 2013 through June 2014 and reported vaccinations from July 2013 through May 2014.
** Statistically significant difference between the 2014-15 BRFSS and the 2014-15 NHIS season by t-test (p<0.05).
- Page last reviewed: September 29, 2016
- Page last updated: September 29, 2016
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- Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (NCIRD)
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