Table 1. Sensitivity, Specificity, PPV and NPV of Signs and Symptoms of Small Bowel Obstruction.

Symptoms	Sensitivity	Specificity	PPV*	NPV**
Pain	75.9	47.6	92.3	19.2
Vomiting	62.6	61.9	93.2	16.7
Constipation	56.3	38	88.2	9.5
Distention	74.1	47.6	92.8	19.6
B.S. Change***	56.9	28.6	86.8	16.7

*Positive Predictive Value **Negative Predictive Value *** Hyperactive or sluggish Bowel Sounds(B.S) Note: Chi Square test has been used