“…A total of 5,332 records were excluded after screening the titles/abstracts because they did not match our inclusion and exclusion criteria. After evaluating 38 full-texts for eligibility, 6 full-text articles were excluded because they do not have the control/comparison group, 5 full-text articles were excluded because they do not have the outcome of interest (risk of COVID-19 infection, severe COVID-19, and mortality), 3 full-text articles were excluded because the articles were not in English, and finally, 24 studies ( Atkins et al, 2020 , Bianchetti et al, 2020 , Covino et al, 2020 , Docherty et al, 2020 , Giorgi Rossi et al, 2020 , Harrison et al, 2020 , Hong et al, 2020 , Hwang et al, 2020 , Jang et al, 2020 , Ji et al, 2020 , Kabarriti et al, 2020 , Knights et al, 2020 , Kokoszka-Bargieł et al, 2020 , Lee et al, 2020 , Miyashita et al, 2020 , Mohamed et al, 2020t , Moon et al, 2020 , Nystad et al, 2020 , Poblador-Plou et al, 2020 , Rozenfeld et al, 2020 , Sapey et al, 2020 , Sung et al, 2020 , Wan et al, 2020 , Yang et al, 2020 ) with a total of 4,648,247 sample size and 46,391 dementia patients were included in the meta-analysis ( Figure 1 ). Of a total of 24 included studies, 21 were retrospective cohort, 2 studies were prospective cohort, while the remaining 1 study was a case-control study.…”