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.

Chiumello et al. Critical Care 2007 11:R82   doi:10.1186/cc6080