Table 4.
Precision and recall for the 10 most frequent symptoms.
| Rank | ICD-10a | Matched, n (%) | Correct answer, n (%) | Searched, n (%) | Precision | Recall |
| 1 | R42 (Dizziness and giddiness) | 146 (9.86) | 173 (7.37) | 254 (11.36) | .575 | .844 |
| 2 | J00 (Acute nasopharyngitisb) | 189 (12.77) | 208 (8.86) | 226 (10.11) | .836 | .909 |
| 3 | R52.9 (Pain, unspecified) | 108 (7.29) | 146 (6.22) | 199 (8.90) | .543 | .740 |
| 4 | F19.6 (Mental and behavioral disordersc) | 142 (9.59) | 168 (7.16) | 197 (8.81) | .721 | .845 |
| 5 | R05 (Cough) | 114 (7.70) | 134 (5.71) | 143 (6.40) | .797 | .851 |
| 6 | H931 (Tinnitus) | 99 (6.68) | 131 (5.58) | 134 (6.00) | .739 | .756 |
| 7 | R26.0 (Ataxic gait) | 41 (2.77) | 59 (2.51) | 120 (5.37) | .341 | .695 |
| 8 | I10 (Essential [primary] hypertension) | 51 (3.44) | 89 (3.79) | 87 (3.89) | .586 | .573 |
| 9 | F51.1 (Nonorganic hypersomnia) | 39 (2.63) | 46 (1.96) | 85 (3.80) | .459 | .848 |
| 10 | R53 (Malaise and fatigue) | 40 (2.70) | 59 (2.51) | 81 (3.62) | .494 | .678 |
aICD-10: International Classification of Diseases, Tenth Revision.
bCommon cold.
cDue to multiple drug use and use of other psychoactive substances.