Table 1.

Probability Parameters^*†

Parameter Name	Base Case Value, % (95% CI)
Prevalence of IAI	1.7 (1.5–1.9)
Sensitivity of CDR strategy‡	97.0 (93.7–98.9)
Specificity of CDR strategy	42.5 (41.6–43.4)
Sensitivity of usual care strategy	99.5 (96.7–100.0)
Specificity of usual care strategy	56.2 (55.3–57.1)
Sensitivity of CDR+ arm	99.5 (96.6–100.0)
Specificity of CDR+ arm	42.2 (41.0–43.3)
Accuracy of abdominal CT in detecting IAI
Sensitivity	98.2 (94.3–99.5)
Specificity	100.0 (98.1–100.0)
% of IAI requiring therapeutic laparotomy or angiography	61.6 (54.5–74.4)

CDR = clinical decision rule; CDR+ = at least one CDR criterion present; IAI = intraabdominal injury requiring acute intervention.

^*See Data Supplement S1 for complete list of probabilities.

^†Probabilities are derived from PECARN study data.¹²

^‡Sensitivity of CDR strategy refers to accuracy of CDR to identify patients with IAI (one or more CDR criterion present) and does not imply CT imaging.