Volume 29, Number 9—September 2023
Research
COVID-19 Epidemiology during Delta Variant Dominance Period in 45 High-Income Countries, 2020–2021
Christine J. Atherstone
, Sarah Anne J. Guagliardo, Anthony Hawksworth, Kevin O’Laughlin, Kimberly Wong, Michelle L. Sloan, Olga Henao, Carol Y. Rao, Peter D. McElroy, and Sarah D. Bennett
, Sarah Anne J. Guagliardo, Anthony Hawksworth, Kevin O’Laughlin, Kimberly Wong, Michelle L. Sloan, Olga Henao, Carol Y. Rao, Peter D. McElroy, and Sarah D. Bennett
Table 3
Ordinal regression results in study of COVID-19 epidemiology in Delta variant dominance period in 45 high-income countries, December 2020–November 2021*
| Model | Peak rate ratio outcome† | Predictor variable | OR (95% CI) | p value |
|---|---|---|---|---|
| 1 |
Cases |
% Vaccination coverage‡ |
0.95 (0.91–0.99) |
0.014 |
| 2 | Deaths | % Vaccination coverage‡ | 0.96 (0.92–0.99)§ | 0.025 |
| % Population >65 y of age |
0.88 (0.78–0.98)§ |
0.021 |
||
| 3 | CFR | % Population >65 y of age | 0.89 (0.80–0.98) | 0.013 |
*Bold indicates statistical significance (p<0.05). CFR, case-fatality rate; OR, odds ratio. †Delta dominance (DD) period: pre-Delta (PD) period ratio. ‡Indicates persons with primary series at date of Delta predominance. §Values shown are adjusted OR (95% CI).
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