Table 3 Classification performance for linear SVM in each state between MDD and HCs and among MDD subgroups.

Groups	State	Acc	AUC	Sensitivity, %	Specificity, %	Cut off Point	Number	acc-P
MDD-HCs	State 1	80.36	0.12	0.18	0.64	0.14	1	0.994
	State 2	81.33	0.72	0.64	0.76	0.49	9	0.023*
	State 3	82.76	0.31	0.42	0.47	0.19	1	1
	State 4	86.73	0.82	0.78	0.76	0.59	156	0.001*
	State 5	80	0.74	0.61	0.83	0.51	15	0.02*
	State 6	86.84	0.57	0.60	0.60	0.36	1	1
SA-NS	State 1	64	0.71	0.50	0.93	0.47	23	0.17
	State 2	64.71	0.58	0.71	0.65	0.46	1	0.172
	State 3	80	0.88	0.88	0.74	0.64	13	0.012*
	State 4	79.63	0.81	0.83	0.75	0.63	99	0.008*
	State 5	75	0.80	0.86	0.67	0.57	6	0.035*
	State 6	72.41	0.75	0.71	0.77	0.55	1	0.018
SI-NS	State 1	62.86	0.58	0.60	0.73	0.44	6	0.189
	State 2	63.41	0.66	0.71	0.59	0.42	3	0.19
	State 3	75	0.78	0.78	0.74	0.58	2	0.023*
	State 4	62.75	0.61	0.70	0.58	0.41	99	0.15
	State 5	72.09	0.72	0.68	0.78	0.53	46	0.027*
	State 6	50.70	0.07	0.17	0.2	0.04	1	0.56
SA-SI	State 1	66.67	0.48	0.4	0.85	0.34	202	0.16
	State 2	63.41	0.61	0.88	0.42	0.37	4	0.194
	State 3	77.36	0.63	0.63	0.78	0.49	39	0.014*
	State 4	56.14	0.57	0.57	0.63	0.36	3	0.386
	State 5	69.23	0.57	0.43	0.8	0.34	10	0.124
	State 6	68.12	0.74	0.68	0.71	0.48	1	0.046*

Number, predictive accuracy as a function of the number of connections used in the best classification process.
Acc accuracy, acc-P the results of permutation test, MDD major depressive disorder, SA suicide attempter, SI suicide ideation, NS neither SA nor SI, HCs healthy controls.
*P < 0.05.

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