Suicide and suicidal behaviour are serious public health issues. Suicide is among the 10 leading causes of death in most countries, and, for every suicide it is estimated that there are more than 30 non-fatal episodes of self-harm. A review of 28 studies looked into the effectiveness of cognitive-behavioural therapies in reducing suicide behaviour. Overall CBT had a highly significant effect but only for adults and only for individual rather than group treatments. There was also evidence for treatment effects, albeit reduced, over the medium term. However, the authors concluded that "although these results appear optimistic in advocating the use of CBT in ameliorating suicidal thoughts, plans and behaviours, evidence of publication bias [the tendency to publish only 'positive' studies) tempers such optimism".
Tarrier, Nicholas, Taylor, Katherine and Gooding, Patricia - Cognitive-behavioural interventions to reduce suicide behaviour: a systematic review and meta-analysis Behavior Modification January 2008, 32(1), 77-108