TABLE 1

Performance of the Portrait Toxigenic C. difficile Assay compared to TBC/CCNAa

Clinical test siteNo. of specimens at siteNo. of specimens with result% sensitivity (CI)% specificity (CI)
TPFPTNFN
1169374127197.4 (86–99)96.9 (92–99)
221944161590100 (91–100)90.9 (85–94)
396159720100 (78–100)88.9 (79–94)
45613240192.9 (66–99)95.2 (83–99)
Total54010931398298.2 (93–99)92.8 (89–95)
  • a TP, true positive; FP, false positive; TN, true negative; FN, false negative; CI, 95% confidence interval.