Table 2 Diagnostic value of the atrial fibrillation detector by basing the diagnosis on different measurements and taking ECG diagnosis as reference

From: Diagnostic accuracy of a home blood pressure monitor to detect atrial fibrillation

  N Readings used Readings needed for diagnosis a ECG (AF +/−) BP monitor (AF +/−) Sensitivity (95% CI) Specificity (95% CI) Agreement (%) Kappa (95% CI)
Readings 217 1 (any) 1 80/137 100/117 0.96 (0.89–0.99) 0.83 (0.76–0.89) 88 0.76 (0.67–0.84)
Subjects 72 1 (first) 1 27/45 30/42 0.93 (0.74–0.99) 0.89 (0.76–0.96) 90 0.80 (0.65–0.94)
Subjects 72 2 (first) 1 27/45 38/34 1.00 (0.84–1.00) 0.76 (0.60–0.87) 85 0.70 (0.54–0.85)
Subjects 72 3 1 27/45 41/31 1.00 (0.84–1.00) 0.69 (0.53–0.81) 81 0.62 (0.46–0.79)
Subjects 72 3 2 27/45 32/40 1.00 (0.84–1.00) 0.89 (0.75–0.96) 93 0.86 (0.74–0.98)
  1. Abbreviations: AF, atrial fibrillation; (+/−), atrial fibrillation diagnosis (yes/no); BP, blood pressure; CI, confidence interval; ECG, electrocardiogram.
  2. aNumber of readings that should indicate AF in order to make an AF diagnosis.