Validity of self-reported medication use
| Predicting actual prescriptions during 1 month* | Predicting actual prescriptions during 3 months† | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Hypertension | Diabetes | Dyslipidaemia | Hypertension | p Value‡ | Diabetes | p Value‡ | Dyslipidaemia | p Value‡ | |
| True-positive, N | 10 356 | 1802 | 6795 | 12 652 | 2261 | 8458 | |||
| True-negative, N | 35 744 | 51 273 | 41 183 | 35 425 | 51 196 | 40 864 | |||
| False-positive, N | 7890 | 1238 | 5694 | 5594 | 779 | 4031 | |||
| False-negative, N | 722 | 399 | 1040 | 1041 | 476 | 1359 | |||
| Sensitivity (95% CI), % | 93.5 (93.0 to 93.9) | 81.9 (80.2 to 83.5) | 86.7(86.0 to 87.5) | 92.4 (91.9 to 92.8) | 0.001 | 82.6 (81.1 to 84.0) | 0.500 | 86.2 (85.5 to 86.8) | 0.273 |
| Specificity (95% CI), % | 81.9 (81.6 to 82.3) | 97.6 (97.5 to 97.8) | 87.9 (87.6 to 88.2) | 86.4 (86.0 to 86.7) | <0.001 | 98.5 (98.4 to 98.6) | <0.001 | 91.0 (90.8 to 91.3) | <0.001 |
| κ Statistic (95% CI), % | 60.7 (59.9 to 61.5) | 67.2 (66.4 to 68.1) | 59.8 (59.0 to 60.6) | 70.9 (70.1 to 71.7) | – | 77.1 (76.2 to 77.9) | – | 69.8 (68.9 to 70.6) | – |
*Check-up month.
†Check-up month and previous 2 months.
‡One month versus 3 months (χ2 test).