Table 3.
Positive predictive value (PPV) of Alzheimer's disease (AD) diagnoses recorded in SIDIAP using information provided by the survey of general practitioners as reference. Sensitivity analysis included all AD patients of participating general practitioners (whether their diagnoses were evaluated or not)
| Population | n | Main analysis | n | Sensitivity analysis | ||||
|---|---|---|---|---|---|---|---|---|
| TP | FP | PPV (95% CI) | TP | FP | PPV (95% CI) | |||
| Women | 92 | 84 | 8 | 91.3 (85.5–97.1) | 128 | 106 | 22 | 82.8 (77.0–87.8) |
| Men | 45 | 39 | 6 | 86.7 (76.7–96.6) | 60 | 49 | 11 | 81.6 (71.9–91.4) |
| <80 years | 84 | 74 | 10 | 88.1 (79.9–94.2) | 105 | 89 | 16 | 84.8 (77.9–91.6) |
| ≥80 years | 54 | 49 | 4 | 92.4 (87.8–100.5) | 83 | 66 | 17 | 79.5 (70.8–88.2) |
| Total | 137 | 123 | 14 | 89.8 (84.7–94.9) | 188 | 155 | 33 | 82.4 (77.0–87.8) |
Abbreviations: TP, true positive; FP, false positive; SIDIAP, Information System for Research in Primary Care.