Note. Question 3ʼs data is presented in Table 2, which displays options provided in the original questionnaire. At the time of data collection, participants were allowed to select all duration options that applied to their experience of PEM. This approach accounts for the detailed breakdowns beyond one month and the higher proportion of respondents reporting symptoms lasting over a month. Within the DSQ-PEM-2, this has been revised to require participants to select only one response to improve clarity and consistency. Although some individuals do have PEM for more than a month and even beyond 2 years, our revised questionnaire only stipulates the time of ‘greater than one month’ because in most cases PEM occurs for less than one month.