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Volume 29, Number 9—September 2023
Research

COVID-19 Epidemiology during Delta Variant Dominance Period in 45 High-Income Countries, 2020–2021

Christine J. AtherstoneComments to Author , 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
Author affiliation: Centers for Disease Control and Prevention, Atlanta, Georgia, USA

Main Article

Table 2

Spearman rank-order correlations in study of COVID-19 epidemiology in Delta variant dominance period in 45 high-income countries, December 2020–November 2021*

Predictor variables Peak rate ratio†
Cases
 Deaths
 CFR
ρ p value ρ p value ρ p value
% Vaccination coverage‡ −0.36 0.018 −0.21 0.17 −0.09 0.58
% Population >65 y of age 0.04 0.82 −0.31 0.039 −0.48 0.001
Population density, persons/km2 −0.05 0.75 −0.12 0.45 0.05 0.76
Median stringency index† 0.04 0.78 0.07 0.63 −0.14 0.35
Median daily testing volume† 0.30 0.048 0.24 0.12 0.18 0.24

*Bold indicates statistical significance (p<0.05). CFR, case-fatality rate; ρ, Spearman rank correlation coefficient. †Delta dominance period to pre-Delta period ratio.
‡Indicates persons with primary series at date of Delta predominance.

Main Article

Page created: July 11, 2023
Page updated: August 20, 2023
Page reviewed: August 20, 2023
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