Table 3.

Classification of FEAR index angle versus sensitivity and specificity in prediction of behavior

Probability level	Correct nonevent	Correct event	Incorrect nonevent	Incorrect event	Sensitivity (%)	Specificity (%)	False negative (%)	False positive (%)
0.35	16	13	7	2	76	89	30	13
0.4	16	14	6	2	79	89	27	12
0.45	14	16	4	4	79	78	22	20
0.5	13	16	4	5	76	72	23	23
0.55	13	16	4	5	76	72	23	23
0.6	13	17	3	5	79	72	18	22
0.65	13	19	1	5	84	72	7	20

FEAR = Femoro-Epiphyseal Acetabular Roof.