Set of responses on the initial items in the Rotterdam Anesthesia Knowledge Questionnaire used to further develop and validate the questionnaire. Data was collected on 2 locations, indicated by the location variable. Responses are recoded into right (1)/wrong (0). There are restrictions on use by commercial parties, and on sharing openly based on (inter)national laws and regulations and written informed consent. Therefore these data (and additional clinical data) are only available upon signing a Data Transfer Agreement (see Terms of Access)