Whether online therapy works as well as sitting face to face with a therapist is one of the larger open questions in mental health care. For depression, a substantial research review by López-López and colleagues in 2019, pooling results from 91 randomised controlled trials, offers a clearer answer than was previously available.
The study compared different ways of delivering cognitive behavioural therapy: traditional face-to-face sessions, hybrid approaches mixing in-person and digital elements, and fully online or multimedia formats. All three produced meaningful reductions in depression compared with no treatment at all. Face-to-face and hybrid CBT showed the strongest results, while online CBT also worked significantly better than waiting for help.
One finding stood out. Being placed on a waiting list made depression worse over time. That is a sobering reminder that beginning something, even an online program, is better than doing nothing while an appointment is pending.
Access is a real barrier for many people. Where getting to a clinic is difficult because of geography, cost, mobility or a full schedule, online or hybrid therapy is a legitimate and evidence-backed option rather than a second-rate substitute.
Depression responds to treatment. If you have been putting off reaching out, the most important step is simply starting, in whatever format works for you.
What the study did
López-López and colleagues carried out a systematic review, meaning a structured search and synthesis of existing research, covering randomised controlled trials of cognitive behavioural therapy for adults with a primary diagnosis of depression. A randomised controlled trial assigns participants at random to different treatments or to no treatment, which helps rule out other explanations for differences seen afterwards.
Rather than simply asking whether CBT works, the researchers used a network meta-analysis. This statistical method allows several treatments to be compared at once, including treatments never tested directly against each other in the same trial, by combining direct and indirect evidence across 91 studies. They looked first at broad categories: face-to-face CBT, hybrid CBT mixing in-person and digital elements, and multimedia CBT delivered entirely through technology. They then used more detailed models to test whether specific ingredients of CBT, such as particular techniques or combinations of techniques, made a difference on their own.
What it found
All three delivery formats produced a larger short-term drop in depression scores than treatment as usual. The size of the effect is reported as a standardised difference in mean change, expressing how much more the treatment group improved than the comparison group in a common statistical unit so different studies can be compared. Each figure comes with a 95% credible interval, the Bayesian equivalent of a confidence interval, showing the range within which the true effect most plausibly sits.
The results were -1.11, with a 95% credible interval of -1.62 to -0.60, for face-to-face CBT; -1.06, from -2.05 to -0.08, for hybrid CBT; and -0.59, from -1.20 to 0.02, for multimedia CBT. Negative values indicate greater improvement. The interval for multimedia CBT nearly touches zero, which means the evidence, while promising, carries more uncertainty than for the other two formats.
Wait list control, meaning simply waiting for treatment, showed a detrimental effect of 0.72, from 0.09 to 1.35. Depression tended to worsen during the wait rather than hold steady.
When the researchers examined specific content components of CBT and combinations of them, they found no evidence that any single component or combination was clearly more effective than others.
Why it matters
This adds pooled evidence that how CBT is delivered, whether face to face, blended or fully digital, may matter less than whether someone receives structured treatment at all. It also establishes that leaving people on waiting lists is not a neutral holding pattern and can carry real cost.
Its limits
The authors note that results need to be interpreted cautiously, particularly for multimedia CBT given its wider uncertainty. The findings concern short-term outcomes, and the component-level analysis could not identify which ingredients of CBT drive its benefits, which remains an open question.
If you are struggling with depression, reaching out to a professional in whatever format is accessible to you is a well-supported first step.