Corrigendum to “Network meta-analysis examining efficacy of components of cognitive behavioural therapy for insomnia’ [Clinical Psychology Review 114 (2024) 102507]. (Clinical Psychology Review (2024) 114, (S0272735824001284), (10.1016/j.cpr.2024.102507))

The authors regret that the printed version of the above article contained an error in the description of the results of the component network meta-analysis. Importantly, the effect of cognitive therapy on insomnia severity was small, albeit significant. This error was caused by an oversight by the authors after the literature search had been updated during the revision process. The following corrections need to be made to the text. 1) In the abstract, the statement: “For the primary outcome insomnia severity, a significant positive effect for sleep restriction therapy (d = −0.45; 95 % CI: [−0.63; −0.36]) was found.” should be replaced with: “For the primary outcome insomnia severity, significant positive effects were found for sleep restriction therapy (d = −0.45; 95 % CI: [−0.63; −0.26]) and cognitive therapy (d = -0.28; 95 % CI: [-0.48; -0.09]).”.2) In the abstract, the statement: “No significant effects of psychoeducation, relaxation therapy, and cognitive therapy, and no further significant effects of any CBT-I component on objective sleep parameters were found.” should be replaced with “No significant effects of psychoeducation and relaxation therapy, and no further significant effects of any CBT-I component on objective sleep parameters were found.”.3) In the abstract, the statement: “The current results suggest that sleep restriction therapy and stimulus control therapy are the most effective components of CBT-I.” should be replaced with “The current results suggest that sleep restriction therapy, stimulus control therapy, and cognitive therapy are the most effective components of CBT-I.”4) In the results, the statement: “The results showed that sleep restriction therapy significantly reduced insomnia severity (d = 0.45; 95 % CI: [-0.63; -0.26]), and the waitlist control condition significantly increased insomnia severity (d = 0.63; 95 % CI: [0.32; 0.93]).” should be replaced with “The results showed that sleep restriction therapy (d = 0.45; 95 % CI: [−0.63; −0.26]) and cognitive therapy (d = −0.28; 95 % CI: [−0.48; −0.09]) significantly reduced insomnia severity. The waitlist control condition (d = 0.63; 95 % CI: [0.32; 0.93]) and active control condition (d = 0.45; 95 % CI: [0.03; 0.87]) significantly increased insomnia severity.5) In the discussion, the statement: “The results of the current network meta-analysis suggest that sleep restriction therapy improves insomnia severity as well as self-reported sleep continuity and sleep quality, and stimulus control therapy improves self-reported and objective total sleep time. In contrast, no evidence was found in favour of psychoeducation, relaxation therapy, and cognitive therapy in the context of insomnia disorder, and no further evidence was found that CBT-I components improve objective sleep parameters.” should be replaced with “The results of the current network meta-analysis suggest that sleep restriction therapy improves insomnia severity as well as self-reported sleep continuity and sleep quality, stimulus control therapy improves self-reported and objective total sleep time, and cognitive therapy improves insomnia severity. In contrast, no evidence was found in favour of psychoeducation and relaxation therapy in the context of insomnia disorder, and no further evidence was found that CBT-I components improve objective sleep parameters.”.6) In the discussion, the statement: “The results of the current meta-analysis also suggest that there is no evidence that cognitive therapy improves self-reported or objective sleep outcomes. This is at odds with a previous large randomised controlled trial (Harvey, Bélanger, et al., 2014) and a systematic review on cognitive therapy (Jansson-Fröjmark & Norell-Clarke, 2018).” should be replaced with “The results of the current meta-analysis also suggest that cognitive therapy improves insomnia severity but has no effect on other self-reported or objective sleep outcomes. The latter is at odds with a previous large randomised controlled trial (Harvey, Bélanger, et al., 2014) and a systematic review on cognitive therapy (Jansson-Fröjmark & Norell-Clarke, 2018).”7) In the discussion, the statement “Thus, cognitive therapy may only be effective when administered in-person by qualified therapists, a hypothesis that should be further investigated in comparative studies.” should be replaced with “Thus, cognitive therapy may be more effective when administered in-person by qualified therapists, a hypothesis that should be further investigated in comparative studies.”.8) In the discussion, the statement “Waitlist increased insomnia severity and decreased self-reported total sleep time, while active control increased self-reported sleep onset latency.” should be replaced with “Waitlist increased insomnia severity and decreased self-reported total sleep time, while active control increased insomnia severity and self-reported sleep onset latency.”9) In the discussion, the statement “The lack of efficacy of cognitive therapy and relaxation therapy suggest that these treatment components should be cautiously used in clinical practice, and further investigated in future high-quality trials.” should be replaced with “The lack of efficacy of relaxation therapy suggests that this treatment component should be cautiously used in clinical practice, and further investigated in future high-quality trials.”10) In the conclusion, the statement “The current results suggest that sleep restriction therapy and stimulus control therapy are the most effective components of CBT-I. More high-quality studies are needed in the fields of cognitive therapy and relaxation therapy, and objective sleep-related outcomes of CBT-I might be investigated more thoroughly in the future.” should be replaced with “The current results suggest that sleep restriction therapy, stimulus control therapy and cognitive therapy are the most effective components of CBT-I. More high-quality studies are needed in the field of relaxation therapy, and objective sleep-related outcomes of CBT-I might be investigated more thoroughly in the future.”The authors would like to apologise for any inconvenience caused.