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Table 3 Sensitivity, specificity, PPV and NPV of SmartRub® device in phase I (part 1 and 2), II and III

From: Assessing the accuracy of a new hand hygiene monitoring device (SmartRub®): from the laboratory to clinical practice

  Sensitivity % (95% CI) Specificity % (95% CI) PPV % (95% CI) NPV % (95% CI)
Phase 1 (bottle only)     
Gel 90.7 (86.2–94.1) 100.0 (98.5–100.0) 99.4 (96.5–99.8) 91.0 (87.2–93.6)
Rinse 99.2 (97.2–99.9) 91.0 (86.8–94.2) 91.7 (88.2–94.2) 99.1 (96.7–99.8)
Phase 1 (bottle and wristband)     
Gel 92.2 (87.6–95.5) 100.0 (98.2–100.0) 99.3 (96.0–99.8) 92.2 (88.1–94.7)
Rinse 96.1 (92.4–98.3) 98.0 (95.1–99.5) 98.0 (94.9–99.2) 96.2 (92.7–98.0)
Phase 2     
Gel 91.8 (87.6–94.9) 83.5 (78.3–88.0) 84.8 (80.7–88.1) 91.0 (86.9–93.9)
Rinse 97.5 (94.7–99.1) 81.2 (75.7–86.0) 83.9 (80.0–87.1) 97.0 (93.7–98.6)
Feedback off 91.8 (87.6–94.9) 82.4 (77.0–86.9) 83.9 (79.8–87.3) 90.9 (86.8–93.9)
Feedback on 97.5 (94.7–99.1) 82.4 (77.0–87.0) 84.7 (80.8–88.0) 97.1 (93.7–98.7)
Phase 3     
Total 96.8 (93.8–98.6) 98.3 (95.7–99.5) 98.3 (95.6–99.3) 96.8 (93.9–98.4)
  1. 95% CI, confident interval 95%; PPV, positive predictive value; NPV, negative predictive value; Phase 1, controlled laboratory condition; Part 1, bottle only, Part 2, bottle and wristband combined; Phase 2, pre-planned clinical path; Phase 3, clinical care condition