Table 2.

Agreement analysis between bladder pressure and bladder pressure

Volumes of saline (ml)	Mean (mmHg)	Bias (mmHg)	Precision (mmHg)	Lower limits of agreement (mmHg)	Upper limits of agreement (mmHg)	Percentage error
100	13.7	4.2	2.9	-1.4 (-4.5 to +1.6)	9.9 (6.9 to 13.0)	± 41%
150	21.1	11.2	9.8	-8.0 (-18.7 to +2.8)	30.4 (19.6 to 41.2)	± 91%
200	27.1	17.6	14.7	-11.1 (-26.4 to +4.3)	46.4 (31.0 to 61.7)	± 106%

Shown is an agreement analysis between bladder pressure measured with 50 ml saline (as reference) and that bladder pressure measured with 100, 150 and 200 ml saline. The bias, precision, limits of agreement and percentage error were computed considering intra-bladder pressure (IBP) at 50 ml versus IBP at 100, 150 and 200 ml.