Comparison of Vaccination Coverage Before and During the COVID-19 Pandemic to Children 0–18 Years of Age at KPSC
| Age . | Prepandemic Period (January to March) . | Stay-at-Home Period . | Adjusted % Difference (95% CI)a (Stay-at-Home Versus Prepandemic) . | Reopening Period (June to August) . | Adjusted % Difference (95% CI)a (Reopening Versus Prepandemic) . | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020, % . | 2019, % . | Rate Ratio (2020 vs 2019) . | 2020, % . | 2019, % . | Rate Ratio (2020 vs 2019) . | 2020, % . | 2019, % . | Rate Ratio (2020 vs 2019) . | |||
| All vaccines | |||||||||||
| 1 mo | 92.6 | 91.0 | 1.02 | 91.8 | 91.6 | 1.00 | −1.4 (−2.7 to −0.2) | 91.4 | 92.0 | 0.99 | −2.4 (−3.5 to −1.2) |
| 3 mo | 81.9 | 80.5 | 1.02 | 78.1 | 83.0 | 0.94 | −7.6 (−9.6 to −5.6) | 81.3 | 82.9 | 0.98 | −3.7 (−5.5 to −1.9) |
| 5 mo | 79.7 | 78.7 | 1.01 | 70.7 | 80.0 | 0.88 | −12.6 (−14.6 to −10.6) | 75.5 | 81.9 | 0.92 | −8.8 (−10.6 to −7.0) |
| 7 mo | 70.4 | 70.2 | 1.00 | 58.4 | 70.7 | 0.83 | −17.6 (−20.0 to −15.2) | 63.3 | 72.0 | 0.88 | −12.3 (−14.5 to −10.1) |
| 16 mo | 70.1 | 68.6 | 1.02 | 66.2 | 69.8 | 0.95 | −7.2 (−9.7 to −4.6) | 68.1 | 70.1 | 0.97 | −5.0 (−7.3 to −2.6) |
| 19 mo | 73.2 | 72.3 | 1.01 | 63.8 | 72.6 | 0.88 | −13.1 (−15.4 to −10.8) | 67.1 | 73.2 | 0.92 | −9.4 (−11.4 to −7.2) |
| 24 mo | 67.0 | 66.6 | 1.01 | 63.6 | 65.7 | 0.97 | −3.8 (−6.6 to −0.8) | 60.3 | 66.5 | 0.91 | −9.8 (−12.2 to −7.4) |
| 7 y | 88.7 | 88.2 | 1.01 | 88.2 | 88.8 | 0.99 | −1.2 (−2.8 to 0.3) | 87.9 | 88.6 | 0.99 | −1.4 (−2.8 to −0.1) |
| 13 y | 53.3 | 52.1 | 1.02 | 53.7 | 51.7 | 1.04 | 1.4 (−2.4 to 5.3) | 51.2 | 53.0 | 0.97 | −5.6 (−8.8 to −2.4) |
| 17 y | 45.4 | 41.8 | 1.09 | 44.2 | 42.0 | 1.05 | −3.0 (−7.4 to 1.5) | 41.3 | 43.2 | 0.96 | −11.9 (−15.4 to −8.3) |
| Measles-containing vaccines | |||||||||||
| 16 mo | 88.2 | 87.1 | 1.01 | 85.9 | 88.8 | 0.97 | −4.6 (−6.0 to −3.1) | 82.5 | 89.8 | 0.92 | −9.3 (−10.6 to −8.0) |
| 7 y | 94.2 | 94.7 | 0.99 | 94.5 | 94.9 | 1.00 | 0.1 (−0.9 to 1.1) | 93.6 | 94.4 | 0.99 | −0.4 (−1.3 to 0.6) |
| Age . | Prepandemic Period (January to March) . | Stay-at-Home Period . | Adjusted % Difference (95% CI)a (Stay-at-Home Versus Prepandemic) . | Reopening Period (June to August) . | Adjusted % Difference (95% CI)a (Reopening Versus Prepandemic) . | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2020, % . | 2019, % . | Rate Ratio (2020 vs 2019) . | 2020, % . | 2019, % . | Rate Ratio (2020 vs 2019) . | 2020, % . | 2019, % . | Rate Ratio (2020 vs 2019) . | |||
| All vaccines | |||||||||||
| 1 mo | 92.6 | 91.0 | 1.02 | 91.8 | 91.6 | 1.00 | −1.4 (−2.7 to −0.2) | 91.4 | 92.0 | 0.99 | −2.4 (−3.5 to −1.2) |
| 3 mo | 81.9 | 80.5 | 1.02 | 78.1 | 83.0 | 0.94 | −7.6 (−9.6 to −5.6) | 81.3 | 82.9 | 0.98 | −3.7 (−5.5 to −1.9) |
| 5 mo | 79.7 | 78.7 | 1.01 | 70.7 | 80.0 | 0.88 | −12.6 (−14.6 to −10.6) | 75.5 | 81.9 | 0.92 | −8.8 (−10.6 to −7.0) |
| 7 mo | 70.4 | 70.2 | 1.00 | 58.4 | 70.7 | 0.83 | −17.6 (−20.0 to −15.2) | 63.3 | 72.0 | 0.88 | −12.3 (−14.5 to −10.1) |
| 16 mo | 70.1 | 68.6 | 1.02 | 66.2 | 69.8 | 0.95 | −7.2 (−9.7 to −4.6) | 68.1 | 70.1 | 0.97 | −5.0 (−7.3 to −2.6) |
| 19 mo | 73.2 | 72.3 | 1.01 | 63.8 | 72.6 | 0.88 | −13.1 (−15.4 to −10.8) | 67.1 | 73.2 | 0.92 | −9.4 (−11.4 to −7.2) |
| 24 mo | 67.0 | 66.6 | 1.01 | 63.6 | 65.7 | 0.97 | −3.8 (−6.6 to −0.8) | 60.3 | 66.5 | 0.91 | −9.8 (−12.2 to −7.4) |
| 7 y | 88.7 | 88.2 | 1.01 | 88.2 | 88.8 | 0.99 | −1.2 (−2.8 to 0.3) | 87.9 | 88.6 | 0.99 | −1.4 (−2.8 to −0.1) |
| 13 y | 53.3 | 52.1 | 1.02 | 53.7 | 51.7 | 1.04 | 1.4 (−2.4 to 5.3) | 51.2 | 53.0 | 0.97 | −5.6 (−8.8 to −2.4) |
| 17 y | 45.4 | 41.8 | 1.09 | 44.2 | 42.0 | 1.05 | −3.0 (−7.4 to 1.5) | 41.3 | 43.2 | 0.96 | −11.9 (−15.4 to −8.3) |
| Measles-containing vaccines | |||||||||||
| 16 mo | 88.2 | 87.1 | 1.01 | 85.9 | 88.8 | 0.97 | −4.6 (−6.0 to −3.1) | 82.5 | 89.8 | 0.92 | −9.3 (−10.6 to −8.0) |
| 7 y | 94.2 | 94.7 | 0.99 | 94.5 | 94.9 | 1.00 | 0.1 (−0.9 to 1.1) | 93.6 | 94.4 | 0.99 | −0.4 (−1.3 to 0.6) |
Adjusted % difference = (ratio of rate ratios − 1) × 100.