Table 7.

Comparison of results of present study with previous studies.

Study	Year	Number of patients	Sensitivity	Specificity	Accuracy	Negative predictive value	Positive predictive value
Al-Sayer et al.	1985	70	86	93	92	96	80
Cusick et al.	1990	283	76	58	69	64	72
Bouvet et al.	1992	78	93.5	75	79.6	88.2	85.3
Afroze et al.	2002	170	61.9	99.3	94.5	94.7	92.8
KO HM et al.	2003	207	78.4	98.2	84.4	66.3	99
Kessler et al.	2005	170	79	98.5	87	76.6	98.7
Present series	2006	75	80	86.6	84	86.6	80