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%

*ICD-9 codes: 965.4: poisoning by aromatic analgesics, not elsewhere classified; E850.3: accidental poisoning by salicylates; E850.4: accidental poisoning by aromatic analgesics, not elsewhere classified; E850.7: accidental poisoning by other nonnarcotic analgesics; E950.0: suicide and self-inflicted poisoning by analgesics, antipyretics, and antirheumatics.

de Achaval et al.

de Achaval et al. BMC Health Services Research 2013 13:72   doi:10.1186/1472-6963-13-72

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