Table 2.
Patients’ safety-relevant knowledge of OAT: Proportion of patients giving correct answers (at a single-item level)a
| Item no. | Item | Intervention group | Control group | ||||
|---|---|---|---|---|---|---|---|
| Baseline | After 12 mo. | After 24 mo. | Baseline | After 12 mo. | After 24 mo. | ||
| 1 | Indication for oral anticoagulation | 60.0% | 61.3% | 60.8% | 60.9% | 57.3% | 55.7% |
| 2 | Awareness of risk treated with OAT | 67.7% | 67.9% | 65.4% | 70.6% | 67.4% | 64.9% |
| 3 | Duration of treatment known | 70.7% | 74.9% | 76.8% | 68.7% | 69.1% | 68.6% |
| 4 | Checking frequencies known | 37.8% | 46.5% | 44.0% | 36.7% | 42.4% | 41.2% |
| 5 | Target INR range known | 37.8% | 59.5% | 56.9% | 36.1% | 45.5% | 43.7% |
| 6 | Foods which contain a large amount of vitamin K | 29.0% | 34.1% | 31.6% | 30.2% | 29.2% | 25.3% |
| 7 | Diet-related recommendations | 70.7% | 68.2% | 69.3% | 65.5% | 67.4% | 66.8% |
| 8 | Safest analgesic that is available without a prescription | 11.0% | 25.1% | 26.8% | 12.7% | 15.4% | 13.8% |
| 9 | What to do after missing medication dose | 19.5% | 28.6% | 30.1% | 16.4% | 19.9% | 16.3% |
| 10 | Awareness that underdosing results in no symptoms | 14.5% | 15.6% | 15.7% | 13.7% | 14.6% | 10.2% |
| 11 | Interactions with OAT | 20.0% | 26.9% | 28.3% | 19.4% | 22.8% | 20.3% |
| 12 | Recognition of emergencies (doctor’s visit necessary) | 6.3% | 22.5% | 16.3% | 6.7% | 5.9% | 6.8% |
| 13 | Knowing when it is important to inform others of OAT | 26.0% | 35.0% | 30.4% | 27.8% | 23.9% | 19.1% |
aAnalyses are based on 736 patients at baseline, 702 after 12 months and 657 patients after 24 months. 12 and 24-month follow-up data for the secondary endpoint patient knowledge were available for all patients who did not drop out. After 24 months, 79 patients (10.7%) dropped out because of death or the patient’s decision to no longer participate