Table 4

Performance of scoring systems, moderately predictive for 'ongoing infection needing relaparotomy' (AUC > 6.0; SOFA day 2 and APS day 1), in selecting patients for relaparotomy using a cut-off value based on a 90% sensitivity.

Relaparotomy required

Yes

No

SOFA

Above 1.4

57

122

PPV^a = 32%

cut-off

Below 1.4

7

19

NPV^b = 73%

(range score 0-18)

Sensitivity = 90%

Specificity = 13%

total

64

141

Yes

No

APS

Above 3.1

62

124

PPV^a = 33%

cut-off

Below 3.1

7

25

NPV^b = 78%

(range score 0-56)

Sensitivity = 89%

Specificity = 17%

total

69

149

^a positive predictive value

^b negative predictive value

van Ruler et al. BMC Surgery 2011 11:38   doi:10.1186/1471-2482-11-38