Feature importance for the GBM allowing for 2-way interactions. Feature importance by rank order. Beck Depression Inventory-II and salience x subcortical region connectivity (Affective_BDI/SAL_x_SUBCort), affective BDI-II (Affective_BDI), FP × salience and salience × subcortical connectivity (FP_x_SAL/SAL_x_SUBCort), right isthmus cingulate volume and left thalamic volume (rh_isthmuscingulate_VOL/LeftThalamusProper_VOL), default mode x dorsal attention connectivity and superior parietal volume (DMN_x_DAN/rh_superiorparietal_VOL), recent CD4/brainstem volume (recent_cd4 Brainstem_VOL), default mode x cerebellum connectivity and visual x salience connectivity (DMN_x_CEREB/VIS_x_SAL), left postcentral cortex volume and female sex (ctxlh-postcentral_Sex), right pericalcarine volume and right precentral volume (rh_pericalcarine_VOL/rh_precentral_VOL), and sensorimotor region × FP connectivity and subcortical intranetwork connectivity (SM_lat_x_FP/SUBCort_x_SUBCort).