Abstract
Introduction
Insomnia affects 30–48% of older adults and impairs health-related quality of life (HRQoL). Numerous studies report Cognitive Behavioral Therapy (CBT-I) as an effective non-pharmacological treatment for insomnia symptoms, with few examining the impact of CBT-I on mental and physical aspects of HRQoL. While limited research suggests that CBT-I leads to improvements in HRQoL, the impact of the cognitive versus behavioral components of CBT-I on HRQoL is unknown.
Methods
128 older adults with insomnia (mean age=69, 66% female, 19% minority) were randomized to receive cognitive therapy (CT), behavior therapy (BT), or CBT-I. The Short Form (36) Health Survey (SF-36) was collected at baseline, post-treatment and six-month follow-up. Split-plot linear mixed models with age and sex as covariates to assess within and between subject changes were used to test intervention, time, and interaction effects on the mental health and physical well-being domains of HRQoL. Significance for all effects was defined as p < 0.05. The effect size (d) was calculated by dividing the difference between means by the root-mean-squared error of the mixed effects model.
Results
The mental health-related QoL improved over time independent of treatment (Main effect of time: F(2, 202) = 6.51, p < 0.002). The interaction failed to reach significance (Interaction: F(4, 202) = 1.19, p = .31). Simple effects revealed significant improvements among CBT-I participants at six months (p = .02, d = .53) and CT participants at post-treatment (p = .00, d = .79) and six months (p = .03, d = .66), but not among BT participants for either time point (p = .32, d = .24; p = .16, d = .35). Treatment did not improve physical health-related QoL over time (F(2, 202) = 1.01, p = .37) nor was there a significant interaction (F(4, 202) = .46, p = .76).
Conclusion
These findings suggest that CBT-I, particularly the CT component, may be effective in improving mental health-related QoL outcomes for older adults with insomnia. In contrast, neither CBT-I nor its component treatments were effective in improving physical health-related QoL.
Support (if any)
NIMHR01MH101468-01; Mental Illness Research, Education, and Clinical Center (MIRECC) at the VAPAHCS
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