Table 3.

Accuracy, sensitivity, specificity, and Kappa index for the SVM model with different combinations of input features.

Number of features	Accuracy %	Sensitivity	Specificity	Kappa	p
1	65.000	0.767	0.533	0.700	0.009**
2	73.333	0.733	0.733	0.533	0.001**
3	70.000	0.700	0.700	0.600	0.002**
4	76.667	0.700	0.833	0.467	0.001**
5	76.667	0.733	0.800	0.467	0.001**
6	75.000	0.700	0.800	0.500	0.001**
7	73.333	0.733	0.733	0.533	0.001**

**permutation test, p < 0.01.