EFTER COVID survey data was collected through Danish- or English-language questionnaires created in SurveyXact26, which could be filled out using a PC, tablet, or smartphone. Participants were asked about these symptoms in relation to the last 14 days from when they responded to the follow-up questionnaire. This was done to estimate the absolute effect of SARS-CoV-2 vaccination on long-term symptoms rather than the effect of infection on long term symptoms. For each outcome, RDs stratified on time since vaccination