Frequency of qualitative OD by aetiology
We first sought to determine the presence of parosmia and phantosmia for each aetiology group separately. Parosmia was most frequently present in postinfectious OD (40.5%), followed by posttraumatic OD (25.8%), and idiopathic OD (17.7%). In contrast, phantosmia was most commonly present in idiopathic OD (25.8%), followed by posttraumatic OD (19.3%) and postinfectious smell loss (13.7%).