After performing multivariable logistic regression and retaining nominally significant variables, two and three vaccination shots remained significant, and their OR were 0.445 and 0.558 in the optimal model (Two shots: p = 0.004; Three shots: p = 0.017) ( Figure 1 ).
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Effect of the number of coronavirus disease 2019 (COVID-19) vaccination shots on the occurrence of pneumonia, severe pneumonia, and death in SARS-CoV-2-infected patients.
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