“…Therefore, it cannot be ruled out that the differential risk of worse outcome between subgroups found by some of the studies is caused by subgroup imbalances in some measured or unmeasured patient characteristics, such as a severer underlying coronary artery disease [38,39] or a deteriorating health status. This may also underlie the increased risk of worse prognosis that is found for cardiac patients with somatic rather than cognitive symptoms of depression [3,40,41] , and ACS patients with persisting or increasing depressive symptoms and treatment-resistant depression [5,6,23,42,43] . MI patients with persisting depressive symptoms report worse physical health 12 months after the MI [44] , supporting that a deteriorating health status may indeed underlie the association with worse prognosis.…”