Table 3.

Agreement analysis between bladder and gastric pressure

Volumes of saline (ml)	Mean (mmHg)	Bias (mmHg)	Precision (mmHg)	Lower limits of agreement (mmHg)	Upper limits of agreement (mmHg)	Percentage error
50	9.5	1.2	4.3	-7.2 (-11.7 to -2.7)	9.6 (5.1 to 14.1)	± 89%
100	13.7	-2.9	6.3	-15.3 (-21.9 to -8.7)	9.5 (2.8 to 16.1)	± 90%
150	21.1	-9.9	13.0	-35.4 (-49.8 to -21.1)	15.6 (1.3 to 30.0)	± 121%
200	27.1	-16.2	17.9	-51.2 (-69.9 to -32.5)	18.8 (0.1 to 37.5)	± 129%

Shown is an agreement analysis between bladder pressure (measured at different volumes of saline) and gastric pressure. The bias, precision, limits of agreement and percentage error were computed considering intra-bladder pressure versus intra-gastric pressure at each volume of saline infused.