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Interaction of the combined moderator and hearing aid condition in predicting the slope of depressive symptom reduction.
Group 1 (black) = active hearing aid group. Group 2 (red) = sham hearing aid group. HRSD change = Change in 24-item HRSD from Week 0 to Week 12. Negative HRSD change = more depressive symptom improvement. When the combined moderator is lower than the cross-point, the active hearing aid group showed more symptom reduction than the sham hearing aid group.
