In the article by El-Haggar et al. entitled “The Phosphodiesterase Inhibitor Pentoxifylline as a Novel Adjunct to Antidepressants in Major Depressive Disorder Patients: A Proof-of-Concept, Randomized, Double-Blind, Placebo-Controlled Trial” [Psychother Psychosom. 2018;87(6):331–9, DOI: 10.1159/000492619], there was an unintentional error in reporting the statistical value in Table 1 and Table 4. By mistake, we reported the F value of Levene’s Test for Equality of Variances instead of the t statistics for age, weight, height, and BMI and the incorrect df was reported for all t test results except HAM-D score. The use of the χ2 test was inappropriate in the article as the assumption that all cells will have an expected value of >5 was not met in many tests. As a result, the Fisher’s exact test was used for categorical data. The error occurred inadvertently during the manuscript preparation.
This unintentional error has no bearing on our study’s findings or conclusions as the p value is still p > 0.5, which is not statistically significant.
An expert biostatistician used valid tests to conduct each analysis, which was then revised by all the authors. The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way.
The corrected Table 1 and Table 4 are shown here.