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Number of elderly patients admitted to our hospital for community-acquired pneumonia. The incidence in April differed significantly between the years 2017, 2018, 2019, and 2020 (p < 0.01 for each by chi-square test), and the incidence in 2020 was significantly lower than that in 2019 (p < 0.002 for each by Ryan's multiple comparison test). There were no significant differences noted in the number of patients in May and June, between 2017, 2018, 2019 and 2020.
