Table 9.

Performance of the scores to predict acute appendicitis in operated on immigrants

	Alvarado	AIR	RIPASA	AAS
Cut-off	>5	>5	>7	>13
Sensitivity	82.4%	82.3%	87.4%	85.0%
Specificity	50.0%	50.0%	41.7%	63.6%
Accuracy	79.9%	79.9%	83.7%	83.2%
PPV	95.1%	95.3%	94.4%	96.2%
NPV	19.4%	18.5%	22.7%	28.0%
AUC (95% c.i.)	0.655 (0.504,0.806)	0.585 (0.375,0.795)	0.613 (0.434,0.792)	0.826 (0.714,0.937)
P	0.076	0.372	0.195	<0.001

Bold value indicate statistically significant results. PPV, positive predictive value; NPV, negative predictive value; AUC, area under receiver operating characteristic (ROC) curve; c.i., confidence intervals; AIR, Appendicitis Inflammatory Response; RIPASA, Raja Isteri Pengiran Anak Saleha Appendicitis; AAS, Adult Appendicitis Score.