Legend: *Prodromes: the presence of at least 1 symptom among pallor, sweating, and nausea was considered positive for prodromes and thus suggestive of reflex syncope in the presence of a typical context/precipitating factor. + Context: participants could provide 1 or more answers among 11 options and we used 9 of them for etiology classification. For reflex syncope: 1) fright/loud noise, 2) stress, 3) pain, 4) sight of blood/injection, 5) heat. For orthostatic hypotension: 7) prolonged standing. For drugs/alcohol: 8) drugs and 9) alcohol. For other diseases (cases in which only fever was specified were not considered as disease) and head trauma: there was an additional blank field to specify other contexts or precipitating factors. This field also allowed to classify some of the previous etiologies. For epileptic seizures: the occurrence of seizures witnessed by others was specifically asked in the questionnaire. Unexplained syncope was considered if none of the previous criteria were met.