Correction: BMC Psychiatry 18, 252 (2018)
https://doi.org/10.1186/s12888-018-1829-1
Following publication of the original article [1], the author identified errors in block randomization and sample size. The correct sentence of block randomization and sample size is given below.
Block randomization
The sentence currently reads:
Patients will then be randomized by one of two research department employees in one of four groups (with a 1:1:1:1 allocation) using a computer script performing block randomization (25 vs 50-sessions; ST vs SPSP).
The sentence should read:
Patients will then be randomized by one of two research department employees in one of four groups (with a 1:1:1:1 allocation) with random allocation sequences that were generated using the SPSS random number generator (SPSS, Chicago).
Sample size
The sentence currently reads:
According to this effect size (and given our choices of α = 0.05, two-tailed, power (1-β) = 0.80) 78 patients are needed in both dosage-groups. When 25% dropout is taken into account at least 200 patients will be needed for inclusion.
The sentence should read:
According to this effect size (and given our choices of α = 0.05, two-tailed, power (1-β) = 0.80) 79 patients are needed in both dosage-groups. When 25% dropout is taken into account at least 211 patients will be needed for inclusion.
Reference
Kool Marit, et al. Optimizing psychotherapy dosage for comorbid depression and personality disorders (PsyDos): a pragmatic randomized factorial trial using schema therapy and short-term psychodynamic psychotherapy. BMC Psychiatry. 2018;18:252. https://doi.org/10.1186/s12888-018-1829-1.
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Kool, M., Van, H.L., Bartak, A. et al. Correction: Optimizing psychotherapy dosage for comorbid depression and personality disorders (PsyDos): a pragmatic randomized factorial trial using schema therapy and short-term psychodynamic psychotherapy. BMC Psychiatry 23, 441 (2023). https://doi.org/10.1186/s12888-023-04920-8
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DOI: https://doi.org/10.1186/s12888-023-04920-8