Figure 4.

Bar graph of relative bladder pressure bias (Y-axis, %) against instilled bladder volume (X-axis, ml). The relative bias for each volume was calculated as the intra-bladder pressure (IBP) at a given volume minus IBP at zero volume divided by IBP at zero volume and expressed as a percentage. Each bar shows the mean value with error bar (standard deviation) for relative bladder pressure bias at different instillation volumes.