Table 1.
Average Annual Number, Rates of Varicella Hospitalizations, and Percentage Decline of Hospitalization Rates by Age Group for Selected Years: 1993–1995 (Prevaccine), 2005–2006 (Mature 1-Dose Period), and 2018–2019 (Mature 2-Dose Period)—United States, 1993–2019a
| Age Group | Prevaccine 1993–1995 | Mature 1-Dose 2005–2006 | Mature 2-Dose 2018–2019 | % Decline in Hospitalization Ratesb | |||||
|---|---|---|---|---|---|---|---|---|---|
| Annual Average No. (%) | Rate/100000 | Annual Average No. (%) | Rate/100000 | Annual Average No. (%) | Rate/100000 | 2005–2006 vs 1993–1995 | 2018–2019 vs 1993–1995 | 2018–2019 vs 2005–2006 | |
| <1 | 1338 (11.0) | 34.8 | 291 (11.5) | 7.2 | 55 (3.9) | 1.9 | 79.2 | 95.9 | 80.1 |
| 1–4 | 4309 (35.4) | 27.2 | 308 (12.1) | 1.9 | 80 (5.8) | 0.5 | 92.9 | 98.1 | 74.0 |
| 5–9 | 2110 (17.3) | 11.1 | 292 (11.6) | 1.5 | 33 (2.4) | 0.1 | 86.4 | 98.6 | 89.3 |
| 10–19 | 816 (6.7) | 2.2 | 312 (12.4) | 0.7 | 118 (8.4) | 0.2 | 67.0 | 87.3 | 61.6 |
| <20 | 8574 (70.4) | 11.3 | 1204 (47.7) | 1.5 | 285 (20.5) | 0.3 | 87.1 | 96.9 | 76.2 |
| 20–49 | 3000 (24.6) | 2.5 | 758 (30.3) | 0.6 | 498 (35.8) | 0.4 | 76.1 | 84.7 | 36.0 |
| <50 | 11 573 (95.1) | 5.9 | 1961 (77.9) | 0.9 | 783 (56.3) | 0.4 | 84.1 | 93.8 | 60.7 |
| ≥50 | 598 (4.9) | 0.9 | 541(21.8) | 0.6 | 608 (43.7) | 0.5 | 30.6 | 40.7 | 14.5NS |
| Totalc | 12 189 (100) | 4.4 | 2510 (100) | 0.9 | 1390 (100) | 0.4 | 80.4 | 90.4 | 51.3 |
Abbreviations: NS, not statistically significant.
a
Numbers reported are averages of the annual weighted numbers; because of that, there may be some slight differences between the total number of cases and the sum of cases for all age groups.
b
Decline statistically significant unless otherwise indicated, P < .05.
c
Rates are age-adjusted for 2000 US Census population.