TABLE 2

Full Influenza Vaccination Coverage Among Children Aged 6 to 23 Months by Influenza Season, Age Group, Racial/Ethnic Group, and Number of Doses Needed to Be Fully Vaccinated, NIS, Provider Report, United States, 2002–2003 Through 2011–2012 Influenza Seasons

Influenza Season
2002–20032003–20042004–20052005–20062006–20072007–20082008–20092009–20102010–20112011–2012Trend Test*
n = 28 967n = 25 316n = 26 181n = 26 981n = 21 991n = 23 825n = 22 961n = 23 747n = 23 098n = 19 490
% ± 95% CI**% ± 95% CI, Change% ± 95% CI, Change% ± 95% CI, Change% ± 95% CI, Change% ± 95% CI, Change% ± 95% CI, Change% ± 95% CI, Change% ± 95% CI, Change% ± 95% CI, ChangeSlope ± 95% CI
Full vaccination coverage
 Overall4.8 ± 0.49.1 ± 0.619.2 ± 0.822.6 ± 0.826.1 ± 1.027.0 ± 1.031.4 ± 1.134.4 ± 1.133.7 ± 1.244.7 ± 1.34.2 ± 0.6
+4.3+10.1+3.4§+3.5§+0.9+4.4§+3.0§–0.7+11.0§
 Age group
  a. 6–11 mo5.3 ± 0.7c9.4 ± 1.119.8 ± 1.322.7 ± 1.625.8 ± 1.730.5 ± 1.8bc35.6 ± 1.9bc36.0 ± 1.9b41.9 ± 2.2bc45.4 ± 2.44.7 ± 0.5
+4.1§+10.4§+2.9§+3.1§+4.7§+5.1§+0.4+5.9§+3.5§
  b. 12–16 mo4.7 ± 0.68.9 ± 1.119.5 ± 1.422.6 ± 1.524.7 ± 1.826.0 ± 1.7a30.4 ± 1.8a33.0 ± 1.9a32.8 ± 2.0ac44.6 ± 2.44.1 ± 0.6
+4.2§+10.6§+3.1§+2.1+1.3+4.4§+2.6–0.2+11.8§
  c. 17–23 mo4.3 ± 0.6a9.1 ± 1.018.1 ± 1.422.3 ± 1.327.0 ± 1.824.1 ± 1.6a27.9 ± 1.8a34.0 ± 1.926.4 ± 1.7ab43.9 ± 2.23.8 ± 0.9
+4.8§+9.0§+4.2§+4.7§–2.9§+3.8§+6.1§–7.6§+17.5§
 Race/ethnicity
  a. Hispanic2.7 ± 0.6bd6.6 ± 1.1bcd15.1 ± 1.6b16.9 ± 1.7bd21.7 ± 2.2bcd22.4 ± 2.2bcd26.6 ± 2.4bcd30.6 ± 2.5bcd31.5 ± 2.7bc40.2 ± 3.1bcd4.0 ± 0.4
+3.9§+8.5§+1.8+4.8§+0.7§+4.2§+4.0§+0.9+8.7§
  b. White only, non-Hispanic6.1 ± 0.5ac11.4 ± 0.8ac23.3 ± 1.1acd27.3 ± 1.1acd30.3 ± 1.3ac31.3 ± 1.3ac36.2 ± 1.3ac38.3 ± 1.4ac36.8 ± 1.4acd49.0 ± 1.6ac4.6 ± 0.8
+5.3§+11.9§+4.0§+3.0§+1.0+4.9§+2.1§–1.5+12.2§
  c. Black only, non-Hispanic2.7 ± 0.9bd4.1 ± 1.3abd13.0 ± 2.1bd15.4 ± 2.1bd17.8 ± 2.6abd17.6 ± 2.4abd21.3 ± 2.6abd24.1 ± 2.6abd25.6 ± 3.1abd35.3 ± 3.5abd3.3 ± 0.5
+1.4+8.9§+2.4+2.4–0.2+3.7§+2.8+1.5+9.7§
  d. Other/multiple race, non-Hispanic6.5 ± 1.9ac10.7 ± 2.5ac17.1 ± 2.3bc23.4 ± 2.6abc27.5 ± 3.6ac30.0 ± 3.3ac33.7 ± 3.9ac39.2 ± 3.9ac35.5 ± 3.7bc48.7 ± 4.2ac4.3 ± 0.6
+4.2§+6.4§+6.3§+4.1+2.5+3.7+5.5–3.7+13.2§
 Doses needed
  a. One45.3 ± 10.6b54.3 ± 5.5b58.0 ± 3.5b52.8 ± 2.3b58.9 ± 2.7b70.0 ± 3.2b72.7 ± 3.0b76.6 ± 2.5b81.7 ± 2.7b74.1 ± 2.4b3.8 ± 1.3
+9.0+3.7–5.2§+6.1§+11.1§+2.7+3.9+5.1§–7.6§
  b. Two4.4 ± 0.4a7.5 ± 0.6a15.9 ± 0.8a15.7 ± 0.8a18.4 ± 1.0a21.5 ± 1.0a25.5 ± 1.1a26.5 ± 1.1a28.4 ± 1.2a32.2 ± 1.5a3.2 ± 0.4
+3.1§+8.4§–0.2+2.7§+3.1§+4.0§+1.0+1.9§+3.8§
≥1 dose coverage
 Overall8.1 ± 0.519.7 ± 0.937.1 ± 1.036.6 ± 1.040.4 ± 1.245.3 ± 1.249.7 ± 1.253.6 ± 1.255.9 ± 1.257.5 ± 1.46.0 ± 1.3
+11.6§+17.4§–0.5+3.8§+4.9§+4.4§+3.9§+2.3§+1.6§
 Race/ethnicity
  a. Hispanic6.4 ± 1.0bd16.0 ± 1.7bd33.3 ± 2.2b31.3 ± 2.2bd37.7 ± 2.6bcd42.7 ± 2.7bcd47.6 ± 2.7bc54.3 ± 2.7cd56.6 ± 2.9cd55.6 ± 3.3bcd6.3 ± 1.1
+9.6§+17.3§–2.0+6.4§+5.0§+4.9§+6.7§+2.3–1.0
  b. White only, non-Hispanic9.3 ± 0.6ac22.4 ± 1.1ac41.0 ± 1.3acd40.6 ± 1.3ac43.1 ± 1.4ac48.0 ± 1.4ac52.9 ± 1.4ac54.2 ± 1.4cd56.7 ± 1.5cd59.4 ± 1.6ac6.0 ± 1.5
+13.1§+18.6§–0.4+2.5§+4.9§+4.9§+1.3+2.5§+2.7§
  c. Black only, non-Hispanic5.1 ± 1.2bd13.6 ± 2.5bd30.1 ± 2.9bd30.3 ± 2.8bd31.8 ± 3.2abd36.6 ± 3.1abd39.8 ± 3.1abd45.4 ± 3.2abd46.9 ± 3.4abd50.5 ± 3.7abd5.4 ± 1.0
+8.5§+16.5§+0.2+1.5+4.8§+3.2+5.6§+1.5+3.6
  d. Other/multiple race, non-Hispanic10.4 ± 2.2ac24.0 ± 3.2ac36.3 ± 3.3bc39.2 ± 3.5ac46.0 ± 4.0ac50.6 ± 3.7ac51.6 ± 4.0c59.4 ± 3.9abc61.5 ± 3.6abc61.8 ± 4.0ac5.9 ± 1.2
+13.6§+12.3§+2.9+6.8§+4.6+1.0+7.8§+2.1+0.3
  • CI, confidence interval half-width.

  • The presence or absence of superscripted letters denotes whether that estimate was statistically significantly different at P < .05 from another row, and denotes which row it differed from (a, b, c, or d) based on pairwise comparison t tests. For example, in 2002–2003, the percentage of fully vaccinated 6- to 11-month-olds (a) was statistically significantly different from the percentage of fully vaccinated 17- to 23-month-olds (c).

  • * Tests for linear trend were performed using a weighted linear regression on the season-specific estimates using season number as the independent variable and weights as the inverse of the estimated variance of the estimated vaccination coverage. The estimated slope coefficients were interpreted as the average change across seasons assuming a linear increase. Slopes and their 95% confidence intervals are presented; all of the tests for linear trend were significant at P < .001.

  • ** Estimates obtained using Kaplan-Meier survival analysis methods.

  • Change in percentage points compared with the previous influenza season.

  • Pair-wise comparisons between adjacent influenza seasons were conducted using t tests; statistically significant (P < .05) differences are footnoted.

  • Age on November first of the influenza season under study.