Table 2.

Thresholds of serum prokineticin 2 level.

Thresholds of prokineticin 2	Sensitivity	Specificity	Likelihood ratio	Youden index
2 ng/mL	1.00	0.33	1.50	0.33
3 ng/mL	0.94	0.53	2.01	0.47
4 ng/mL	0.84	0.67	2.53	0.51
5 ng/mL	0.68	0.73	2.54	0.41
6 ng/mL	0.51	0.80	2.57	0.31
7 ng/mL	0.41	0.87	3.11	0.28
8 ng/mL	0.34	0.90	3.43	0.24