Corrigendum to "Brief training in mindfulness meditation reduces symptoms in patients with a chronic or recurrent lifetime history of depression: A randomized controlled study" [Behaviour Research and Therapy 99 (2017) 124-130].

The authors regret to inform that the following errors have occurred: 1. While criteria based on structured diagnostic interviews were consistently applied throughout the study as reported, we recently noticed that our report has failed to reflect protocol changes, aimed at easing recruitment and taking account of fluctuations in symptoms, that resulted in changes in three of the inclusion criteria listed under “2.1. Participants” (p. 125). This concerns the inclusion criteria b) “onset of the disorder before age 19”, which was changed to be unrestricted, c) “self-reported severity of symptoms on the Beck Depression Inventory-II (BDI-II) of at least 19”, which was changed to 14 in order to accommodate fluctuations in symptoms following the interview, and d) “age range 25–60” which was extended to 20 to 65. Descriptive characteristics of the whole groups and pre-to post-changes across the whole groups remain as reported, but it is important to note that as a result of the above described changes, the sample included 5 participants (3 in the Mindfulness-based intervention group (MBI), 2 in the control group) who had a BDI–II–score lower than 19, 18 participants (10 in the MBI group, 8 in the control group) who had an onset of the disorder later than age 19 and 11 participants who (4 in the MBI group, 7 in the control group) were younger than 25 or older than 65. According to the initially reported criteria 27 of the 68 participants would have had to be excluded from the sample (13 in the MBI Group, 14 in the control group). In order to check whether results remained robust in the smaller sample of n = 41 participants meeting the stricter initial criteria (n = 23 in the MBI group, n = 18 in the control group), we computed main and interaction effects for our primary and secondary outcomes. Table 1 presents an overview of the main results as reported in the original paper in contrast to the results in the smaller sample of n = 41, which matches the reported criteria. All previously reported significant effects were visible also in the smaller group, with the exception of the main effect of time for the Leiden Inventory of Depression Sensitivity-Revised (LEIDS-R), one of our secondary outcomes. [Table presented] 2. In section 2.3.5. „The Leiden Index of Depression Sensitivity-Revised (LEIDS-R; Van der Does, 2002)“, page 126, line 3 it should read „five subscales“ instead of „four subscales“. 3. The „Results“ section (p. 128) contains two typos that we would like to correct: In the passage reporting results for the Brooding scale of the Ruminative Response Style Questionnaire (p. 128, column 2, line 24) the main effect of time should read F(1, 66) = 7.94 instead of F(1, 66) = 7.91. In Table 1 of the original publication, the standard deviation of the BDI–II–score in the “Mindfulness”-group at post-assessment seems to have been mistakenly copied from the “Psycho-Education and Resting-group”. The correct standard deviation of the BDI-II score (Mindfulness) Post is 8.8 instead of 6.1. 4. We failed to state the secondary affiliation with the “Department of Psychiatry and Psychotherapy, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany” for the first and second authors, Emilia Winnebeck and Maria Fissler, of this article. The affiliation has been added in this corrigendum. The authors would like to apologise for any inconvenience caused.