March et al. found that CBT significantly improved the mental health of 327 adolescents with depression, compared to antidepressant drugs and a combination of both. After 36 weeks, 81% of the CBT group, 81% of the antidepressant group, and 86% of the combined group showed significant improvement. CBT's brief, cost-effective nature, taking only 6 to 12 sessions, makes it a popular choice for public health care systems.