Table. Incidence and IRRs by Developmental Period and Age Bracket in US States Experiencing Spikes in COVID-19 Cases.
| State | State data end datea | Adolescents, youth, or combined | Older adults | IRR (95% CI) | ||
|---|---|---|---|---|---|---|
| Cases/cohort population, No. | Incidence rate | Cases/cohort population, No. | Incidence rate | |||
| Adolescents (ages 10-19 y) vs older adults (ages ≥60 y) | ||||||
| Alaska | October 31 | 1811/99 499 | 0.018 | 2330/142 099 | 0.016 | 1.12 (1.04-1.18) |
| Colorado | October 22 | 9890/731 951 | 0.014 | 15 476/1 199 263 | 0.013 | 1.05 (1.02-1.07) |
| Michigan | November 17 | 37 393/1 267 877 | 0.030 | 92 591/2 393 510 | 0.039 | 0.76 (0.75-0.77)b |
| Montana | October 23 | 3001/137 796 | 0.022 | 5668/286 567 | 0.020 | 1.10 (1.05-1.15) |
| Nevada | October 30 | 8727/391 347 | 0.022 | 14 107/683 039 | 0.021 | 1.08 (1.05-1.11) |
| New Mexico | October 23 | 4513/285 393 | 0.016 | 6726/518 073 | 0.013 | 1.22 (1.17-1.26) |
| North Dakota | October 23 | 4658/97 348 | 0.048 | 7143/167 040 | 0.043 | 1.12 (1.08-1.16) |
| Oregon | October 30 | 4840/504 711 | 0.010 | 7136/985 350 | 0.007 | 1.33 (1.28-1.37) |
| Pennsylvania | October 30 | 18 319/1 568 292 | 0.012 | 55 956/3 301 963 | 0.017 | 0.69 (0.68-0.70)b |
| South Carolina | December 5 | 33 151/673 843 | 0.049 | 49 368/1 211 555 | 0.041 | 1.21 (1.19-1.22) |
| South Dakota | October 23 | 4052/117 276 | 0.035 | 7569/225 553 | 0.034 | 1.03 (0.99-1.07)c |
| Tennessee | November 11 | 38 925/855 574 | 0.046 | 52 404/1 577 807 | 0.034 | 1.35 (1.34-1.37) |
| Wisconsin | October 23 | 22 857/748 773 | 0.031 | 34 286/1 428 853 | 0.024 | 1.27 (1.25-1.29) |
| Youth (ages 15-24 or 18-24 y) vs older adults (ages ≥60 or ≥65 y) | ||||||
| Alabamad | November 13 | 25 413/458 530 | 0.055 | 30 186/854 313 | 0.035 | 1.57 (1.54-1.59) |
| Floridae | November 12 | 140 515/2 555 315 | 0.055 | 126 647/4 465 169 | 0.028 | 1.94 (1.92-1.95) |
| Oklahomae | October 22 | 22 499/543 700 | 0.041 | 15 853/635 222 | 0.025 | 1.66 (1.63-1.69) |
| Rhode Islandf | October 24 | 4696/145 880 | 0.032 | 7017/265 058 | 0.027 | 1.22 (1.17-1.26) |
| Adolescents plus youth (ages 10-24 y) vs Older adults (ages ≥65 y) | ||||||
| Minnesota | October 23 | 32 186/1 081 469 | 0.030 | 16 017/921 491 | 0.017 | 1.71 (1.68-1.75) |
| Missouri | October 23 | 28 634/1 192 555 | 0.024 | 19 278/1 033 964 | 0.019 | 1.29 (1.27-1.31) |
Abbreviation: IRR, incidence rate ratio.
a
All data collection dates in 2020.
b
Opposite direction from the other states.
c
Not significantly different.
d
Youth ages 18 to 24 years vs older adults 65 years or older.
e
Youth ages 15 to 24 years vs older adults 65 years or older.
f
Youth ages 15 to 24 years vs older adults 60 years or older.