Table 3.

Discriminating capacity of the AIR-score overall, in subsets of patients and according to the examiner’s competence, expressed as the ROC area

Characteristics	ROC area*			ROC area*
	Appendicitis	95% CI	p-value	Complicated	95% CI	p-value
All patients	0.83	0.82–0.84		0.89	0.88–0.90	<0.001**
Patients sex			0.18			0.16
Women	0.84	0.82–0.85		0.90	0.88–0.91
Men	0.82	0.80–0.84		0.88	0.86–0.90
Patients age			0.001			< 0.001
<15 years	0.87	0.84–0.90		0.93	0.90–0.95
15–39 years	0.83	0.81–0.84		0.89	0.88–0.91
≥40 years	0.79	0.76–0.82		0.84	0.82–0.87
Duration of symptoms			0.001			<0.001
<12 h	0.80	0.77–0.83		0.84	0.80–0.88
12–23 h	0.81	0.78–0.84		0.86	0.83–0.89
24–47 h	0.83	0.80–0.85		0.89	0.86–0.91
>47 h	0.87	0.85–0.89		0.93	0.91–0.95
Examiners competence			0.61			0.15
Interns	0.82	0.80–0.84		0.88	0.86–0.90
Residents	0.83	0.81–0.85		0.90	0.88–0.92
Specialists	0.82	0.79–0.85		0.86	0.83–0.90

^*ROC is Receiver Operating Curve

^**p-value for the comparison of the ROC are for all appendicitis and complicated appendicitis