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Percentage of correctly classified self-identified users (SIUs) given users’ queries for drugs, diseases, symptoms, and their combinations (n=18,859).
| Attribute | Correctly classified, n (%) |
| Drugs | 6751 (35.80) |
| Diseases | 16,652 (88.30) |
| Symptoms | 6695 (35.50) |
| Drugs and diseases | 16,671 (88.40) |
| Drugs and symptoms | 6714 (35.60) |
| Diseases and symptoms | 16,675 (88.42) |
| All three attributes | 16,659 (88.33) |
