Table 3.

Support Vector Machine Classification of Recent Suicidal Attempters Versus Suicidal Ideators Based on Functional Brain Connectivity and Estimation of the Influence of Other Participant Risk Factors on Classifier Performance^a

Classifier	Mean Accuracy, %	P	Mean FPR	Mean TPR	Mean AUC
Recent Suicide Attempters vs Suicidal Ideators (FC only)	78.8	.002	0.222	0.788	0.9
Recent Suicide Attempters vs all depressed (Suicidal Ideators + Depressed Non-Suicidal Controls)	53.1	.551	0.423	0.531	0.565
Stable Suicide Attempters vs Suicidal Ideators	58.0	.330	0.222	0.58	0.635
Presence vs absence of lifetime suicidal behavior	54.3	.348	0.45	0.543	0.613
Recent Suicide Attempters vs Suicidal Ideators (clinical and behavioral data)	38.1	.236	0.556	0.375	0.319
Recent Suicide Attempters vs Suicidal Ideators (FC + clinical and behavioral data)	73.6	.023	0.222	0.750	0.833

^aNull hypothesis: AUC = 0.5. Boldface indicates statistical significance.

Abbreviations: AUC = area under the curve, FC = functional connectivity, FPR = false-positive rate, TPR = true positive rate.