Table 1. Demographic Characteristics of the Study Population of Children 6 Months Through 8 Years.
| Demographic characteristic | 2012–2013 influenza season | 2013–2014 influenza season | ||
|---|---|---|---|---|
| Unweighted n | Weighted % (±95% CI) | Unweighted n | Weighted % (±95% CI) | |
| Overall | 51,620 | 100 | 65,848 | 100 |
| Gender | ||||
| Male | 26,593 | 51.0 (0.9) | 33,789 | 51.3 (0.9) |
| Female | 25,027 | 49.0 (0.9) | 32,059 | 48.7 (0.9) |
| Agea | ||||
| 6–23 months | 10,632 | 17.1 (0.7) | 13,414 | 17.4 (0.6) |
| 2–4 years | 18,082 | 33.6 (0.9) | 22,782 | 33.5 (0.8) |
| 5–8 years | 22,906 | 49.4 (0.9) | 29,652 | 49.1 (0.9) |
| Child's race/ethnicity | ||||
| Hispanic | 9,757 | 25.3 (1.0) | 12,828 | 24.6 (0.9) |
| Black, non-Hispanic | 5,344 | 14.1 (0.7) | 6,774 | 14.1 (0.7) |
| White, non-Hispanic | 30,250 | 50.7 (1.0) | 37,970 | 51.4 (0.9) |
| Other/multiple races, non-Hispanic | 6,269 | 10.0 (0.6) | 8,276 | 9.8 (0.5) |
| Mother's education level | ||||
| <12 years | 4,938 | 12.7 (0.7) | 6,499 | 13.1 (0.7) |
| 12 years | 9,704 | 20.5 (0.8) | 12,039 | 19.3 (0.7) |
| >12 years, not college graduate | 13,077 | 25.6 (0.9) | 16,663 | 25.5 (0.8) |
| College graduate | 21,940 | 38.0 (0.9) | 28,070 | 38.6 (0.8) |
| Poverty statusb | ||||
| Above poverty, >$75,000/year | 18,278 | 30.1 (0.9) | 23,596 | 30.8 (0.8) |
| Above poverty, ≤$75,000/year | 18,845 | 35.2 (0.9) | 23,122 | 33.3 (0.8) |
| At or below poverty level | 9,711 | 25.9 (1.0) | 12,520 | 25.3 (0.9) |
| Unknown | 4,786 | 8.9 (0.5) | 6,610 | 10.5 (0.5) |
| No. of children o18 in household | ||||
| 1 child | 17,578 | 25.8 (0.8) | 21,005 | 23.5 (0.7) |
| 2 children | 20,653 | 41.4 (1.0) | 26,301 | 40.9 (0.9) |
| ≥3 children | 13,206 | 32.7 (1.0) | 18,276 | 35.4 (0.9) |
| Household in MSA | ||||
| MSA, principal city | 18,067 | 34.8 (0.9) | 18,331 | 27.5 (0.8) |
| MSA, not principal city | 22,318 | 48.9 (1.0) | 34,460 | 58.1 (0.9) |
| Non-MSA | 11,235 | 16.3 (0.6) | 13,057 | 14.4 (0.5) |
| Doses to be fully vaccinated | ||||
| 1 dose | 20,802 | 38.0 (0.9) | 28,518 | 41.7 (0.9) |
| 2 doses | 30,818 | 62.0 (1.0) | 32,632 | 58.3 (0.9) |
| 6–23 months | ||||
| 1 dose | 2,128 | 16.4 (1.4) | 2,974 | 18.8 (1.3) |
| 2 doses | 8,504 | 83.6 (1.4) | 10,440 | 81.2 (1.3) |
| 2–4 years | ||||
| 1 dose | 7,989 | 41.1 (1.6) | 10,678 | 45.4 (1.6) |
| 2 doses | 10,093 | 58.9 (1.6) | 12,104 | 54.6 (1.6) |
| 5–8 years | ||||
| 1 dose | 10,685 | 43.3 (1.3) | 14,866 | 47.3 (1.2) |
| 2 doses | 12,221 | 56.7 (1.3) | 14,786 | 52.7 (1.2) |
Source: National Immunization Survey-Flu (NIS-Flu), 2012–2013 and 2013–2014 influenza seasons.
a
Age as of November 1 of the respective influenza season.
b
Income/poverty level was defined based on total family income in the past calendar year, and the U.S. Census poverty thresholds for that year specified for the applicable family size and number of children aged <18 years. Poverty thresholds are available at www.census.gov/hhes/www/poverty/data/threshld/index.html.
MSA, Metropolitan Statistical Area; No., number.