Table 4

 Summary statistics of accuracy of interpretation of electrocardiograms by reader and type

Reader and electrocardiogram typeSensitivity (95% CI)Specificity (95% CI)
Interpretative software:
 12 lead83.3 (78.3 to 88.2)99.1 (98.7 to 99.5)
General practitioner:
 12 lead79.8 (70.5 to 87.2)91.6 (90.1 to 93.1)
 Limb lead82.5 (74.8 to 88.7)88.5 (86.9 to 90.2)
 Chest lead84.8 (78.7 to 91.0)86.4 (84.6 to 88.3)
Practice nurse:
 12 lead77.1 (67.4 to 85.0)85.1 (83.0 to 86.9)
 Limb lead72.0 (63.9 to 80.1)83.4 (81.4 to 85.4)
 Chest lead68.7 (60.1 to 76.4)82.8 (80.7 to 84.8)
General practitioner and interpretative software*:
 12 lead91.9 (86.6 to 97.3)91.1 (89.6 to 92.6)

For the purposes of calculations for this table, “uncertain” diagnoses are counted as missed diagnoses for sensitivity and as not atrial fibrillation for specificity (see tables 1-3).

*Defined as positive result if either (or both) is positive.