TABLE 4

Comparison of Vaccination Coverage Before and During the COVID-19 Pandemic to Children 0–18 Years of Age at KPSC

AgePrepandemic Period (January to March)Stay-at-Home PeriodAdjusted % 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 mo92.691.01.0291.891.61.00−1.4 (−2.7 to −0.2)91.492.00.99−2.4 (−3.5 to −1.2)
 3 mo81.980.51.0278.183.00.94−7.6 (−9.6 to −5.6)81.382.90.98−3.7 (−5.5 to −1.9)
 5 mo79.778.71.0170.780.00.88−12.6 (−14.6 to −10.6)75.581.90.92−8.8 (−10.6 to −7.0)
 7 mo70.470.21.0058.470.70.83−17.6 (−20.0 to −15.2)63.372.00.88−12.3 (−14.5 to −10.1)
 16 mo70.168.61.0266.269.80.95−7.2 (−9.7 to −4.6)68.170.10.97−5.0 (−7.3 to −2.6)
 19 mo73.272.31.0163.872.60.88−13.1 (−15.4 to −10.8)67.173.20.92−9.4 (−11.4 to −7.2)
 24 mo67.066.61.0163.665.70.97−3.8 (−6.6 to −0.8)60.366.50.91−9.8 (−12.2 to −7.4)
 7 y88.788.21.0188.288.80.99−1.2 (−2.8 to 0.3)87.988.60.99−1.4 (−2.8 to −0.1)
 13 y53.352.11.0253.751.71.041.4 (−2.4 to 5.3)51.253.00.97−5.6 (−8.8 to −2.4)
 17 y45.441.81.0944.242.01.05−3.0 (−7.4 to 1.5)41.343.20.96−11.9 (−15.4 to −8.3)
Measles-containing vaccines
 16 mo88.287.11.0185.988.80.97−4.6 (−6.0 to −3.1)82.589.80.92−9.3 (−10.6 to −8.0)
 7 y94.294.70.9994.594.91.000.1 (−0.9 to 1.1)93.694.40.99−0.4 (−1.3 to 0.6)
  • a Adjusted % difference = (ratio of rate ratios − 1) × 100.