Table 7.

Diagnostic properties in the high probability zone

Characteristics	AIR score 9–12
	Any appendicitis
	PPV	95% CI	p-value	Specificity	95% CI	p-value
All patients	86	83–90		98	97–99
Patients sex			0.25			0.31
Women	84	78–90		98	97–99
Men	89	84–93		98	97–99
Patients age			0.18			<001
<15 years	96	90–100		99	98–100
15–39 years	86	81–92		99	98–99
≥40 years	83	76–89		95	94–97
Duration of symptoms			0.74			0.047
<12 h	84		71–98	99	98–100
12–23 h	89		81–97	98	97–100
24–47 h	86		79–93	97	95–98
>47 h	87		80–93	98	96–99
Examiners competence			0.49			0.23
Interns	87	81–93		98	97–99
Residents	88	82–94		98	97–99
Specialists	83	74–92		97	95–99

PPV and Specificity for any appendicitis is given as the focus is avoiding negative appendectomy