Table 2. Accuracy of GP judgment for the diagnosis of dementia
SensitivitySpecificityPPVNPVLRPLRN
(95% CI)(95% CI)(95% CI)(95% CI)(95% CI)(95% CI)
GP judgment(n= 240)56 (47 to 65)89 (81 to 94)86 (77 to 93)62 (54 to 70) 5.1 (2.9 to 8.8)0.49 (0.40 to 0.61)
Age ≥80 years(n= 123)57 (45 to 67)84 (67 to 94)89 (77 to 96)46 (34 to 59) 3.6 (1.7 to 7.6)0.52 (0.39 to 0.68)
Age <80 years(n= 117)55 (40 to 70)91 (82 to 97)81 (64 to 93)75 (65 to 84) 6.5 (2.9 to 15)0.49 (0.35 to 0.68)
Men(n= 126)50 (38 to 62)85 (73 to 93)79 (64 to 90)59 (48 to 70) 3.2 (1.7 to 6.2)0.59 (0.46 to 0.77)
Women(n= 114)63 (50 to 74)94 (84 to 99)93 (81 to 99)66 (54 to 77)10.4 (3.4 to 31.7)0.40 (0.29 to 0.55)
  • LRP = positive likelihood ratio. LRN = negative likelihood ratio. NPV = negative predictive value. PPV = positive predictive value.