Table 5.

Predictability of difficult cholecystectomy at different cut-off points

Cut-off point	Sensitivity	Specificity	Predictive positive value	Predictive negative value	Youden’s index
1	0.99	0.05	0.53	0.90	0.04
2	0.98	0.20	0.57	0.94	0.18
3	0.97	0.44	0.65	0.94	0.41
4	0.95	0.58	0.71	0.91	0.53
5	0.90	0.67	0.74	0.86	0.57
6	0.84	0.77	0.79	0.82	0.61
7	0.81	0.81	0.82	0.82	0.62
8	0.75	0.88	0.87	0.76	0.63
9	0.61	0.92	0.90	0.69	0.53
10	0.44	0.95	0.91	0.61	0.39
11	0.26	0.97	0.91	0.55	0.23
12	0.09	0.99	0.93	0.50	0.08
13	0.01	1.00	1.00	0.48	0.01

No patients had a score greater than or equal to 14