Mediation model examining the role of caregiver burden in caregiver depressive symptoms. (A) Serial mediation explaining caregiver depressive symptoms with medical visits as an independent variable. (B) Serial mediation explaining caregiver depressive symptoms with patient self-rated health as an independent variable. (C) Serial mediation explaining caregiver depressive symptoms with patient depressive symptoms as an independent variable. Nonsignificant paths appear in dash-dotted lines.