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. 2022 Feb 10;17(2):e0263814. doi: 10.1371/journal.pone.0263814

Fig 2. Temporal trend of the number of surgeries for acute appendicitis in a serial bi-weekly manner (study group: January 1, 2020–June 30, 2020; control group: January 1, 2019–July 1, 2019; leap year: 2020).

Fig 2

The line of the study group depressed from the third bi-week (January 29–February 11) to eighth bi-week (April 8–April 21). Dates are shown for the study group; for the control group, add 1 day to each date after February 28.