2013-14 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 2013-14 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,‡ 2013-14 influenza season
| Total | Change from 2012-13|| to 2013-14 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 | 8,501 | 51.8 | ±2.0 | 1.3 | 49.5 | ±2.9 | 52.5 | ±5.3 | 54.0 | ±4.3 | 57.6 | ±5.3 |
| 6-23 months | 811 | 63.5 | ±5.7 | -5.7 | 63.3 | ±8.0 | 44.2 | ±15.7 | 72.9 | ±10.2 | 61.5 | ±15.5 |
| 2-4 years | 1,521 | 57.5 | ±3.7 | -2.6 | 57.5 | ±5.9 | 55.6 | ±10.0 | 57.1 | ±6.3 | 60.8 | ±10.4 |
| 5-12 years | 3,997 | 52.0 | ±2.9 | 2.8 | 48.1 | ±4.7 | 55.6 | ±7.6 | 55.4 | ±5.7 | 58.5 | ±8.0 |
| 13-17 years | 2,172 | 42.0 | ±3.5 | 1.2 | 41.5 | ±4.7 | 45.8 | ±8.4 | 38.8 | ±7.3 | 49.2 | ±11.2 |
| NIS-Flu | ||||||||||||
| Age Group | ||||||||||||
| 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 |
| 6-23 months | 13,414 | 74.3 | ±2.0 | -2.6 | 74.6 | ±2.1 | 67.9 | ±6.8 | 76.6 | ±4.7 | 75.3 | ±5.3 |
| 2-4 years | 22,782 | 68.1 | ±1.8 | 2.3 | 65.9 | ±2.0 | 64.3 | ±5.1 | 72.7 | ±4.2 | 72.8 | ±4.7 |
| 5-12 years | 62,590 | 61.0 | ±1.1 | 2.4 | 56.5 | ±1.1 | 59.3 | ±2.9 | 69.7 | ±3.0 | 66.1 | ±2.7 |
| 13-17 years | 28,074 | 46.4 | ±1.5 | 3.9 | 43.6 | ±1.8 | 46.3 | ±4.2 | 51.1 | ±4.2 | 53.7 | ±4.7 |
| Difference Percent Vaccinated, NIS-Flu -NHIS | ||||||||||||
| Age Group | ||||||||||||
| 6 months-17 years | 7.1¶ | ±2.2 | 5.7¶ | ±3.0 | 4.7 | ±5.7 | 12.0¶ | ±4.8 | 7.3¶ | ±5.7 | ||
| 6-23 months | 10.8¶ | ±6.0 | 11.3¶ | ±8.3 | 23.7¶ | ±16.5 | 3.7 | ±11.0 | 13.8 | ±15.9 | ||
| 2-4 years | 10.6¶ | ±4.1 | 8.4¶ | ±6.2 | 8.7 | ±11.2 | 15.6¶ | ±7.6 | 12.0¶ | ±11.0 | ||
| 5-12 years | 9.0¶ | ±3.1 | 8.4¶ | ±4.8 | 3.7 | ±8.1 | 14.3¶ | ±6.4 | 7.6 | ±8.4 | ||
| 13-17 years | 4.4¶ | ±3.8 | 2.1 | ±5.0 | 0.5 | ±9.4 | 12.3¶ | ±8.4 | 4.5 | ±12.0 | ||
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).
Table2. 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,§, 2013-14 influenza season
| Total | Change from 2012-13¶ to 2013-14 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 | 29,650 | 43.0 | ±1.2 | 0.4 | 46.4 | ±1.4 | 36.5 | ±2.4 | 32.9 | ±2.4 | 42.7 | ±3.7 |
| 18-64 years | 22,914 | 36.5 | ±1.2 | 0.4 | 38.8 | ±1.6 | 32.8 | ±2.5 | 29.6 | ±2.4 | 38.5 | ±3.9 |
| 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 | 15,262 | 31.4 | ±1.4 | 0.9 | 32.6 | ±2.0 | 30.0 | ±3.1 | 26.8 | ±2.9 | 34.8 | ±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 |
| 50-64 years | 7,652 | 47.7 | ±2.0 | -0.3 | 49.8 | ±2.4 | 39.9 | ±4.5 | 40.8 | ±4.7 | 49.4 | ±8.4 |
| ≥65 years | 6,736 | 71.5 | ±1.8 | -0.1 | 73.4 | ±2.2 | 60.5 | ±6.3 | 64.0 | ±5.7 | 70.3 | ±7.1 |
| BRFSS | ||||||||||||
| Age Group | ||||||||||||
| ≥18 years | 354,572 | 42.2 | ±0.4 | 0.7 | 45.4 | ±0.4 | 35.6 | ±1.4 | 33.1 | ±1.4 | 40.1 | ±2.0 |
| 18-64 years | 233,459 | 36.7 | ±0.6 | 1.0 | 38.9 | ±0.6 | 32.2 | ±1.6 | 30.7 | ±1.4 | 37.7 | ±2.2 |
| 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 | 119,708 | 32.3 | ±0.6 | 1.2 | 33.9 | ±0.8 | 29.3 | ±2.0 | 28.0 | ±1.8 | 35.7 | ±2.5 |
| 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 |
| 50-64 years | 113,751 | 45.3 | ±0.6 | 0.2 | 47.1 | ±0.8 | 39.0 | ±2.4 | 40.7 | ±2.7 | 45.4 | ±3.1 |
| ≥65 years | 121,113 | 65.0 | ±0.6 | -1.2 | 66.6 | ±0.6 | 56.6 | ±2.7 | 57.8 | ±3.1 | 62.4 | ±3.7 |
| Difference in percent vaccinated, BRFSS – NHIS | ||||||||||||
| Age Group | ||||||||||||
| ≥18 years | -0.8 | ±1.3 | -1.0 | ±1.5 | -0.9 | ±2.8 | 0.2 | ±2.8 | -2.6 | ±4.2 | ||
| 18-64 years | 0.2 | ±1.3 | 0.1 | ±1.7 | -0.6 | ±3.0 | 1.1 | ±2.8 | -0.8 | ±4.5 | ||
| 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 | 0.9 | ±1.5 | 1.3 | ±2.2 | -0.7 | ±3.7 | 1.2 | ±3.4 | 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 | ||
| 50-64 years | -2.4** | ±2.1 | -2.7** | ±2.5 | -0.9 | ±5.1 | -0.1 | ±5.4 | -4.0 | ±9.0 | ||
| ≥65 years | -6.5** | ±1.9 | -6.8** | ±2.3 | -3.9 | ±6.9 | -6.2 | ±6.5 | -7.9 | ±8.0 | ||
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).
- Page last reviewed: September 17, 2015
- Page last updated: September 17, 2015
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- Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (NCIRD)
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