Volume 29, Number 2—February 2023
Research Letter
Epidemiology of SARS-CoV-2 Omicron BA.5 Infections, Macau, June–July 2022
Weijia Xiong, Liping Peng, Tim K. Tsang
, and Benjamin J. Cowling
, and Benjamin J. Cowling
Table
Estimated incubation periods for SARS-CoV-2 Omicron BA.5 variant according to population percentiles using lognormal, gamma, or Weibull probability distributions in study of epidemiology of SARS-CoV-2 Omicron BA.5 infections, Macau, June–July 2022*
| Percentile | Incubation, d (95% Cl) |
||
|---|---|---|---|
| Lognormal | Gamma | Weibull | |
| Mean | 3.27 (3.07–3.45) | 3.00 (2.83–3.16) | 3.26 (3.07–3.40) |
| 2.5th | 1.46 (1.17–1.74) | 1.87 (1.74–2.00) | 1.10 (0.93–1.25) |
| 5th | 1.64 (1.37–1.90) | 2.02 (1.89–2.16) | 1.38 (1.20–1.52) |
| 50th | 3.04 (2.87–3.18) | 2.95 (2.79–3.12) | 3.23 (3.03–3.38) |
| 95th | 5.67 (4.97–6.67) | 4.13 (3.94–4.33) | 5.24 (4.74–5.52) |
| 97.5th | 6.39 (5.49–7.77) | 4.39 (4.19–4.59) | 5.61 (5.05–5.94) |
| 99th |
7.34 (6.16–9.29) |
4.70 (4.49–4.91) |
6.03 (5.40–6.44) |
| AIC value† | 360.80 | 377.57 | 370.45 |
*Mean number of days was estimated after adjusting for exponential growth. AIC, Akaike information criterion. †AIC values were calculated to compare the fit of each model.
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