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The first confirmed COVID-19 case in Hong Kong has announced on 23 January 2020: the first wave from 23 January to 29 February; the second wave from 17 March to 21 April; the third wave from 5 July to 31 August 2020. We estimated adjusted odds ratios (ORs) of COVID-19 effects in 2020 on 28-day mortality by multivariable logistic regression models adjusted propensity score as covariate by week.
