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. 2021 Jul 25;18(15):7859. doi: 10.3390/ijerph18157859

Figure 1.

Figure 1

Sample size of healthcare workers (HCWs) in the Czech Republic—Epi-Info TM version 7.2.4. Population size: Total number of healthcare workers in the Czech Republic in 2017 [30]. Expected frequency: The overall prevalence of side effects following COVID-19 vaccines ranged between 62% and 93%; therefore, 60% was assumed as a threshold. Acceptable margin of error: The permissible level for all CoVaST groups will be 5%. Design effect: One—per the recommendation of the CDC for simple sampling [29]. Clusters: One—per the recommendation of the CDC for simple sampling [29]. The pragmatic sample size is 368–635 (CI 95%–99%).