Table 2.

Performance of PACT-3D in test set

Performance Metrics	Simulated Test Set value (95% CI)	Prospective Test Set value (95% CI)	External Test Set value (95% CI)
Sensitivity	0.81 (0.75–0.86)	0.83 (0.77–0.90)	0.81 (0.71–0.88)
Specificity	0.99 (0.98–1.0)	0.99 (0.98–0.99)	0.97 (0.94–0.98)
PPV	0.41 (0.34–0.48)	0.44 (0.37–0.52)	0.79 (0.69–0.87)
F1-score	0.54 (0.47–0.61)	0.58 (0.51–0.65)	0.80 (0.74–0.86)
Sensitivity in etiology
Gastro-duodenal	0.93 (0.82–0.98)	0.87 (0.73–0.94)
Small Bowel	1.0 (0.87–1.0)	0.88 (0.63–0.98)
Large Intestine	0.64 (0.41–0.77)	0.73 (0.50–0.89)
Trauma	1.0 (0.57–1.0)	0.83 (0.45–0.97)
Post-operative	0.59 (0.33–0.84)	0.8 (0.55–0.93)
Sensitivity in total volume of free air
Total volume > 1 ml	0.89 (0.84–0.93)	0.91 (0.86–0.95)	0.86 (0.75–0.93)
Total volume > 10 ml	0.95 (0.90–0.98)	0.98 (0.93–1.0)	0.92 (0.80–0.97)