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. 2018 Nov 5;12:2261–2265. doi: 10.2147/OPTH.S170789

Table 2.

Sensitivity, specificity, PPV, and NPV for ICD-9 codes for toxic maculopathy for identifying patients with hydroxychloroquine toxicity

Value Percentage
Sensitivity 67.92
Specificity 98.72
PPV 81.82
NPV 97.31

Abbreviations: NPV, negative predictive value; PPV, positive predictive value.