Patient demographics and international normalised ratio (INR) tests
| Age group (years) | n | Mean age (years) | Men | INR tests | INR control | ||||
|---|---|---|---|---|---|---|---|---|---|
| Mean INR | Number/ patient/year | Dosing interval (days) | <2.0 | >3.0 | <2.0 or >3.0 | ||||
| Data are mean (SD) or percentage. | |||||||||
| Number of INR tests increased significantly with age: <65 v 65–75 years (p<0.01) and 65–75 v >75 years (p<0.01). Correspondingly, the interval between tests shortened significantly with increasing age: <65 v 65–75 years (p<0.01) and 65–75 v >75 years (p<0.01). No significant between group differences were observed with respect to INR control. | |||||||||
| <65 | 149 | 56.4 (7.8) | 67.1% | 2.4 (0.3) | 17.4 (5.1) | 21.0 (2.6) | 25.3% | 12.7% | 37.9% |
| 65–75 | 284 | 69.8 (2.7) | 63.0% | 2.4 (0.2) | 36.8 (6.7) | 9.9 (2.2) | 22.2% | 14.2% | 36.4% |
| >75 | 306 | 80.3 (2.8) | 45.4% | 2.5 (0.3) | 45.7 (6.0) | 8.1 (6.9) | 22.3% | 15.4% | 37.7% |