Table 1.
The basic information of the included literature. OD: olfactory dysfunction. N: no data.
| Author | Country | Age | Duration | Total No. of persistent OD | Total No. of OD |
|---|---|---|---|---|---|
| María | Spain | 46.8 ± 13.9 | 12 months | 43 | 78 |
| Jerome | Multicenter | 45.0 ± 12.0 | 24 months | 6 (4 anosmia, 2 hyposmia) | 123 |
| Can | France | 50.4 ± 18.9 | 9.5 months | 93 (11 anosmia, 82 hyposmia) | 229 |
| Constantin | Germany | 49.0 ± 14.4 | 8 months | 85 (55 hyposmia) | 212 |
| Luigi | Italy | 38.4 ± 12.5 | 253.4 ± 70.5 days | 127 (18 anosmia, 109 hyposmia) | 306 |
| Francesca | Italy | N | 12 months | 46 | 176 |
| Luigi | Multicenter | 39.9 ± 0.5 | 419.8 days | 45 (8 anosmia, 37 hyposmia) | 119 |
| Ameen | Israel | 37.5 (19–74) | 229 days | 31 | 65 |
| Martin | Germany | 45 ± 2.06 | 201 days | 1 | 26 |
| JR | Multicenter | 44.5 ± 16.4 | 6 months | 11 (6 anosmia, 5 hyposmia) | 233 |
| Nhu | France | 45 | 6 months | 136 | 584 |
| Mads | Multicenter | 43.3 | 6 months | 12 | 34 |