Psychological Therapies of Depression Flashcards
If there is a big difference between the therapies, there needs to be a ____ sample size (Active therapy vs a wait list control)
Small
If there is a small difference between the therapies, there needs to be a _____ sample size (Two active therapies)
Large
ES =
Pre-therapy score minus post-therapy score divided by the pooled SD
What does the ES state?
The magnitude of the difference between conditions A and B
Is ES affected by sample size?
No
What is reliable improvement?
Improvement that is reliably greater than measurement error or chance
What is clinically-significant improvement?
Measurement score moves from a clinical to a non-clinical population
Smith and Glass (1977)
Treatment > placebo > no treatment
ES for treatment vs no treatment studies = .80 - large effect size according to Cohen
Average treated patient is better off than ____ of people receiving no treatment
79%
Wampold (2015)
Psychological therapies are superior to medical interventions
Robinson et al. (1990) - therapy vs no-treatment
ES = 0.73 (N = 37) significant
Robinson et al. (1990) - therapy vs wait list
ES = 0.84 (N = 29) significant
Robinson et al. (1990) - therapy vs placebo
ES = 0.28 (N = 9) not significant
Elkin et al. (1989) - method
250 patients randomised to one of 4 conditions
- CBT
- Interpersonal therapy (IPT)
- Imipramine + clinical management
- Control (Placebo and clinical management)
Elkin et al. (1989) - results
Imipramine does best for severe depression
IPT out-performs CBT
CBT out-performs control condition by only a small amount