Table 2. Performance comparison of schemas (1), (2), (3) and (4) with different k.

Schema		Accuracy	Sensitivity	Specificity
(1)		0.5825 ± 0.0336	0.3123 ± 0.0853	0.8151 ± 0.0227
(2)		0.7844 ± 0.0337	0.5610 ± 0.0585	0.9769 ± 0.0144
(3)		0.8341 ± 0.2788	0.7074 ± 0.0822	0.9433 ± 0.0325
(4)	k = 5	0.6976 ± 0.0241	0.5877 ± 0.0391	0.7829 ± 0.0603
	k = 10	0.7133 ± 0.0198	0.5732 ± 0.0347	0.8340 ± 0.0403
	k = 20	0.7100 ± 0.0293	0.5315 ± 0.0118	0.8550 ± 0.0359