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Baseline characteristics of the pre- and post-education groups
| Characteristics | Pre-education group (n=40) | Post-education group (n=34) | P value |
| Female, % | 45 | 47 | 1.0 |
| Mean age, years | 75 | 69 | 0.14 |
| Mean weekly warfarin dose, mg | 25.5 | 25.4 | 0.94 |
| Mean INR prior to vitamin K administration | 4.3 | 3.6 | 0.18 |
Note: Fisher exact test and Student t test were used for analysis. INR = international normalized ratio.
