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. 2025 Jan 3;20(1):e0313689. doi: 10.1371/journal.pone.0313689

Table 1. Overview of employed time (explanatory) variable.

Pandemic Phase Calendar Weeks/Months/Year Share of Observations in the Sample
Before 7 to 37/February to September/2018 32%
First wave 6 to 20/February to May/2020 4%
Summer 2020 21 to 39/May to September/2020 11%
Second wave 40 to 8/September to February/2020-2021 3%
Alpha wave 9 to 23/February to June/2021 21%
Summer 2021 24 to 30/June to July/2021 2%
Delta wave 31 to 51/August to December/2021 2%
Omicron Wave 52 to 21/December 2021 to May 2022 21%
Summer 2022 21 onwards/May 2022 onwards 5%

Source: Own presentation based on RKI [7].