Fig. 3From: The effect of vitamin K on prothrombin time in critically ill patients: an observational registry studyBoxplot of changes in PT-INR and delta PT-INR. Whiskers represent maximum and minimum values up to 1.5*IQR. Outliers were defined as > 1.5*IQR and are removed from the picture but were included in the calculations. VK, vitamin K; PT-INR, prothrombin time, international normalized ratio. **p ≤ 0.01, ***p < 0.001Back to article page