Quantitative literature review of three articles including the design used and confounding variable

Quantitative literature review of three articles including the design used and confounding variable. Articles: Lowe, C., & Wuthrich, V. M. (2021).

Randomised controlled trial of study without stress: A cognitive behavioural therapy program to reduce stress in students in the final year of high school.

Child Psychiatry & Human Development, 52(2), 205-216. https://doi.org/10.1007/s10578-020-01099-x Whelen, M. L., & Strunk, D. R. (2021). Does cognitive behavioral therapy for depression target positive affect?

Examining affect and cognitive change session-to-session. Journal of Consulting and Clinical Psychology, 89(9), 742-750. Gillham, J., Reivich, K., Brunwasser, S., Freres, D., Chajon, N., Kash-MacDonald, V. M., Chaplin, T., Abenavoli, R., Matlin, S., Gallop, R., & Seligman, M. P. (2012).

Evaluation of a Group Cognitive-Behavioral Depression Prevention Program for Young Adolescents: A Randomized Effectiveness Trial. Journal of Clinical Child & Adolescent Psychology, 41(5), 621-639. Thank you.