Long-term remission and relapse of anxiety and depression in older adults after Cognitive Behavioural Therapy (CBT): A 10-year follow-up of a randomised controlled trial.

BACKGROUND:This study examined the long-term durability of cognitive behaviour therapy (CBT) for older adults with comorbid anxiety and depression 10 years after treatment, in comparison to an active control group. METHOD:Participants from a randomised controlled trial for older adults with comorbid anxiety and depression (Wuthrich et al., 2016) were re-contacted. Participants had received either group CBT or an active control treatment (Discussion Group). The final sample (N = 54; Aged 70-84, Mage = 76.07, SD = 3.83; 59 % of the eligible original sample) completed a diagnostic interview, cognitive assessment and self-report measures of symptoms and quality of life. RESULTS:CBT was associated with significantly improved long-term (10-year) efficacy for reducing anxiety and depression in older adults compared to the Discussion group. Effects included higher rates of remission (58 % remission of all diagnoses vs 27 %, 88 % of all depressive diagnoses vs 54 %, 63 % of all anxiety diagnoses vs 35 %, 67 % of primary diagnosis vs 42 %), lower rates of relapse (25-31 % vs 50-78 %) and lower rates of chronic treatment-resistance (8 % primary disorder vs 39 %, 21 % any disorder vs 58 %). Participants who showed an acute treatment response at post-treatment were 7-9 times more likely to be in remission after 10 years than those with residual symptoms. LIMITATIONS:Results may not generalise to those who do not complete CBT, and the time trajectory of symptom change is unclear. CONCLUSIONS:Long-term improvements in symptoms are specific to CBT. Results provide compelling evidence for CBT as an effective and durable treatment for late-life anxiety and depression.