*For subjects with >1 potential cancer, each cancer was counted separately. Subjects with no potential cancers were counted once. ICD-9 codes identified more subjects with >1 potential cancer, resulting in a higher total. †False negative diagnoses include those with no cancer diagnosis according to VACCR or ICD-9 code, respectively, as well as those with incorrect coding of the cancer type (two VACCR diagnoses and nine ICD-9 code diagnoses). |
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Table 2:Validity of Veterans Affairs Central Cancer Registry (VACCR) versus ICD-9 code cancer-type-specific diagnoses, with medical chart review as the gold standard*. |