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Functional impairment of olfactory identification ability in the three groups of participants.
| Severity | NC | MCI | AD |
|---|---|---|---|
| Normal n (%) | 109 (80.1%) | 89 (47.3%) | 13 (31.0%) |
| Mild n (%) | 22 (16.2%) | 65 (34.6%) | 12 (28.6%) |
| Moderate n (%) | 3 (2.2%) | 24 (12.8%) | 6 (14.3%) |
| Severe or loss n (%) | 2 (1.5%) | 10 (5.3%) | 11 (26.2%) |
