Nurwati, N.Y.T. et al. 2026. Depression Level Classification Using Compact Cross-Domain Feature Engineering on Sleep, Physical Activity, and Demographic Data. Indonesian Journal of Electronics, Electromedical Engineering, and Medical Informatics. 8, 3 (Jul. 2026), 335–351. DOI:https://doi.org/10.35882/ijeeemi.v8i3.356.