Table 3.

The efficacy of Alvarado score components for diagnosis

AS components	AA+ (n)	AA− (n)	Sensitivity %	Specificity %	PPV %	NPV %	p
Migration of pain	87	10	69.6	67.7	89.6	35.5	<0.001
Anorexia	95	18	76	41.9	84	30.2	0.05
Nausea and/or vomiting	68	12	54.4	61.2	85	25
Right lower quadrant tenderness	125	31	100	100
Rebound	116	21	92.8	32.2	84.6	52.6	<0.001
Elevation of temperature ≥37.3°C	15	0	12	100	100	21.9	<0.05
Leukocytosis ≥10 ×103/mm3	79	9	63.2	70.9	89.7	32.3
Polymorphonuclear neutrophilia ≥%75	70	5	56	83.8	93.3	32

AA: acute appendicitis; PPV: positive predictive value; NPV: negative predictive value