Abstract
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.
Original language | English |
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Article number | 441 |
Journal | BMC psychiatry |
Volume | 23 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Dec 2023 |