Table 3.
Positive Predictive value with 95% confidence interval of dementia diagnoses in the National Patient and Cause of Death Registers
| National Patient Register1 | Cause of Death Register2 | |||||
| FP (n) | TP (n) | PPV (95% CI) | FP (n) | TP (n) | PPV (95% CI) | |
| Prevalent cases | 40 | 174 | 81.3 (75.4–86.3) | 4 | 81 | 99.0 (97.4–99.7) |
| Men | 12 | 41 | 77.4 (63.8–87.7) | 1 | 16 | 94.1 (71.3–99.9) |
| Women | 28 | 133 | 82.6 (75.9–88.1) | 3 | 65 | 95.6 (87.6–99.1) |
| ≤69 y | 16 | 18 | 52.9 (35.1–70.2) | 1 | 4 | 80.0 (28.3–99.5) |
| 70–79 y | 15 | 71 | 82.6 (72.9–89.9) | 0 | 10 | 100 (69.2–100) |
| 80–89 y | 8 | 74 | 90.2 (81.7–95.7) | 3 | 41 | 93.2 (81.3–98.6) |
| ≥90 y | 1 | 11 | 91.7 (61.5–99.8) | 0 | 26 | 100 (86.8–100) |
| AD | 56 | 73 | 56.6 (47.6–65.3) | 23 | 44 | 65.7 (53.1–76.8) |
| VaD | 20 | 11 | 35.5 (19.2–54.6) | 1 | 1 | 50.0 (1.26–98.7) |
| OD | 58 | 11 | 15.9 (8.24–26.7) | 14 | 2 | 12.5 (1.55–38.3) |
Age refers to age at first register detection in National Patient Register and age at death in Cause of Death Register. 1Follow-up from 1964 to screening; 2Follow-up for one year from screening. FP, false positive; TP, true positive; PPV, positive predictive value; CI, confidence interval; AD, Alzheimer’s diseases; VaD, vascular dementia.