Table 1.
Characteristics of participants aged ≥18 years during the 2010-2011 through 2015-2016 influenza seasons
| Subgroup and age group (years) | Influenza season a |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2010-2011 | 2011-2012 | 2012-2013 | 2013-2014 | 2014-2015 | 2015-2016 | |||||||
| No. of Persons | Weighted % | No. of Persons | Weighted % | No. of Persons | Weighted % | No. of Persons | Weighted % | No. of Persons | Weighted % | No. of Persons | Weighted % | |
| All participants | ||||||||||||
| ≥18 | 28,445 | 100.0 | 30,194 | 100.0 | 31,077 | 100.0 | 33,126 | 100.0 | 32,790 | 100.0 | 29,345 | 100.0 |
| 18-64 | 22,574 | 82.9 | 23,835 | 82.5 | 24,233 | 81.9 | 25,555 | 81.4 | 24,839 | 81.0 | 21,602 | 80.4 |
| 18-49 | 15,635 | 57.5 | 16,094 | 56.7 | 16,268 | 56.0 | 17,008 | 55.4 | 16,385 | 55.1 | 14,021 | 54.8 |
| 50-64 | 6,939 | 25.4 | 7,741 | 25.7 | 7,965 | 25.9 | 8,547 | 25.9 | 8,454 | 25.9 | 7,581 | 25.6 |
| ≥65 | 5,871 | 17.1 | 6,359 | 17.5 | 6,844 | 18.1 | 7,571 | 18.6 | 7,951 | 19.0 | 7,743 | 19.6 |
| Race/ethnicity (aged ≥18 years) | ||||||||||||
| Non-Hispanic White | 16,568 | 68.2 | 17,954 | 67.1 | 18,542 | 66.3 | 20,321 | 66.0 | 20,368 | 65.3 | 19,406 | 64.5 |
| Non-Hispanic Black | 4,351 | 11.3 | 4,430 | 11.4 | 4,510 | 11.4 | 4,562 | 11.5 | 4,310 | 11.6 | 3,472 | 11.6 |
| Hispanic | 5,163 | 13.8 | 5,327 | 14.6 | 5,406 | 15.0 | 5,490 | 15.0 | 5,489 | 15.4 | 4,044 | 15.7 |
| Other | 2,363 | 6.6 | 2,483 | 6.9 | 2,619 | 7.3 | 2,753 | 7.4 | 2,623 | 7.7 | 2,423 | 8.2 |
| Person with high-risk conditions b | ||||||||||||
| 18-64 | 4,478 | 19.5 | 4,704 | 19.1 | 4,853 | 18.9 | 5,175 | 19.0 | 5,021 | 18.9 | 4,389 | 18.9 |
| 18-49 | 2,178 | 14.0 | 2,184 | 13.6 | 2,264 | 13.4 | 2,352 | 13.5 | 2,257 | 13.0 | 1,927 | 13.0 |
| 50-64 | 2,300 | 31.9 | 2,520 | 31.3 | 2,589 | 30.8 | 2,823 | 30.9 | 2,764 | 31.3 | 2,462 | 31.4 |
| Health-care personnel (≥18 years) c | 2,300 | 8.2 d | 2,541 | 8.5 d | 2,597 | 8.7 d | 2,651 | 8.2 d | 2,646 | 8.4 d | 2,458 | 8.1 d |
| Pregnant women (18-49 years) e | NA | NA | NA | NA | 697 | 2.0 f | 712 | 2.0f | 655 | 2.0 f | 559 | 2.0 f |
Estimates are based on interviews conducted during August-June for each influenza season (e.g., the 2010-2011 season included persons interviewed from August 2010 through June 2011, and vaccination received during July 2010-May 2011).
Adults categorized as being at high risk for influenza-related complications reported 1 or more of the following: 1) ever being told by a physician that they had diabetes, emphysema, chronic obstructive pulmonary disease (COPD, starting from the 2012-13 season), coronary heart disease, angina, heart attack, or another heart condition; 2) receiving a diagnosis of cancer during the preceding 12 months (excluding non-melanoma skin cancer) or ever being told by a physician that they had lymphoma, leukemia, or blood cancer; 3) being told by a physician that they had chronic bronchitis or weak or failing kidneys during the preceding 12 months; or 4 ) reporting an asthma episode or attack during the preceding 12 months. In addition, the weighted percentage is prevalence of high-risk conditions by age groups.
Adults were classified as health-care personnel if they reported they currently volunteer or work in a hospital, medical clinic, doctor’s office, dentist’s office, nursing home or some other health care facility including part-time and unpaid work in a health care facility as well as professional nursing care provided in the home.
Percentage of adults aged ≥18 years who were health-care personnel.
Adult women were classified as pregnant if they reported they were pregnant anytime during August through March for each influenza season. Data were not available for the 2010-11 and 2011-12 influenza seasons.
Percentage of pregnant women among adults aged ≥18 years.