| Authors | Patients with OD | Patients with OD + GD | Mode of collecting data | Objective assessment of OD | Onset of OD (days) | Duration of OD (days) | Recovery time (days) | Treatment given |
|---|---|---|---|---|---|---|---|---|
| Thakur et al101 | Anosmia/hyposmia-179/250 (71.6%) | - | Oral questionnaire | - | Before-44(17.6%); after-77 (30.8%); concomitant-58(23.2%) | Recovery time-1-4/5-8/9-14/more than 15 days-17 (6.8%)/87 (34.8%)/103(41.2%)/43 (17.2%) | - | |
| Teaima et al102 | Anosmia-67.9%; hyposmia-30.0%; phantosmia-18.0%; parosmia-28.4% | Anosmia & ageusia-50.2%; hyposmia & hypogeusia-23.3% | Questionnaire | - | After COVID symptoms-43.5% Sudden onset-80.4% | After 6 months-complete/partial/no recovery-66.0%/22.1%/11.9% | - |
OD: olfactory dysfunction, GD: gustatory dysfunction, COVID: coronavirus disease