Figure 3

Boxplot of absolute bladder pressure bias (Y-axis, mmHg) against instilled bladder volume (X-axis). The absolute bias for each volume was calculated as intra-bladder pressure (IBP) at a given volume minus IBP at zero volume. Each box shows the median values and quartiles for absolute bladder pressure bias. Outliers (cases with values between 1.5 and three box lengths from the upper or lower edge of the box) are denoted with circles. Extreme cases (cases with values more than three box lengths from the upper or lower edge of the box) are denoted with asterisks. For both outliers and extreme cases, the patient number is shown above the symbol.