Table 3 Sensitivity, positive predictive value (PPV), and percentage of false positives identified by selected International Classification of Disease (ICD-9) codes* used to document emergency department (ED) visits for acetaminophen exposure or overdose, stratified by age group
Age category (Years) (Number of cases) | ICD-9 code | Total number of visits | Total number of cases | Sensitivity (%) | PPV (%) | False positive visits (%) |
|---|---|---|---|---|---|---|
965.4 | 290 | 269 | 85.1% | 92.8% | 7.2% | |
E850.4 | 87 | 82 | 25.9% | 94.3% | 5.7% | |
E850.7 | 1 | 1 | 0.3% | 100.0% | 0.0% | |
All ages | E950.0 | 98 | 71 | 22.5% | 72.4% | 27.6% |
(N=316) | 965.4 OR E850.4 | 290 | 269 | 85.1% | 92.8% | 7.2% |
965.4 OR E950.0 | 319 | 275 | 87.0% | 86.2% | 13.8% | |
E850.4 OR E950.0 | 185 | 153 | 48.4% | 82.7% | 17.3% | |
965.4, E850.4 OR E950.0 | 319 | 275 | 87.0% | 86.2% | 13.8% | |
Age 0-5 | 965.4 | 140 | 133 | 86.4% | 95.0% | 5.0% |
E850.4 | 75 | 72 | 46.8% | 96.0% | 4.0% | |
(N=154) | 965.4 OR E850.4 | 140 | 133 | 86.4% | 95.0% | 5.0% |
965.4 | 62 | 57 | 80.3% | 91.9% | 8.1% | |
E850.3 | 3 | 2 | 2.8% | 66.7% | 33.3% | |
Age 6-14 | E850.4 | 9 | 7 | 9.9% | 77.8% | 22.2% |
(N=71) | E950.0 | 42 | 29 | 40.8% | 69.0% | 31.0% |
965.4 OR E850.3 | 65 | 59 | 83.1% | 90.8% | 9.2% | |
965.4 OR E850.4 | 62 | 57 | 80.3% | 91.9% | 8.1% | |
965.4 OR E950.0 | 78 | 61 | 85.9% | 78.2% | 21.8% | |
E850.3 OR E950.0 | 45 | 31 | 43.7% | 68.9% | 31.1% | |
E850.4 OR E950.0 | 51 | 36 | 50.7% | 70.6% | 29.4% | |
965.4, E850.3 OR E850.4 | 65 | 59 | 83.1% | 90.8% | 9.2% | |
965.4, E850.3 OR E950.0 | 81 | 63 | 88.7% | 77.8% | 22.2% | |
965.4, E850.4 OR E950.0 | 78 | 61 | 85.9% | 78.2% | 21.8% | |
E850.3 OR E850.4 OR E950.0 | 54 | 38 | 53.5% | 70.4% | 29.6% | |
965.4, E850.3, E850.4 OR E950.0 | 81 | 63 | 88.7% | 77.8% | 22.2% | |
965.4 | 88 | 79 | 86.8% | 89.8% | 10.2% | |
Age 15-24 | E850.4 | 3 | 3 | 3.3% | 100.0% | 0.0% |
(N=91) | E950.0 | 56 | 42 | 46.2% | 75.0% | 25.0% |
965.4 OR E850.4 | 88 | 79 | 86.8% | 89.8% | 10.2% | |
965.4 OR E950.0 | 101 | 81 | 89.0% | 80.2% | 19.8% | |
E850.4 OR E950.0 | 59 | 45 | 49.5% | 76.3% | 23.7% | |
965.4, E850.4 OR E950.0 | 101 | 81 | 89.0% | 80.2% | 19.8% |