

Alexander Lisinski
690 posts

@a_lisinski
PhD in psychopharmacology, University of Gothenburg. Resident psychiatrist, Sahlgrenska University Hospital.



australian universities: we are underfunded also australian universities:


Does combined treatment with antidepressants and psychotherapy really cause twice as many suicide attempts than psychotherapy only? This was the conclusion of a recent meta-analysis published in Psychological Medicine. Me and @f_hieronymus took a closer look…thread below 🧵



First of many paper from our international ECT survey just out. On all 5 measures of efficacy most recipients, and most relatives, reported that it either made no difference or made things worse. Did help a minority Paper on informed consent out on Friday dx.doi.org/10.1111/inm.70…










I dug into a meta-analysis paper where something seems off to me, but its not my area, thus want to check on it. Looking at the project's data, it is clear that the effect sizes were calculated in one of two ways: - Pooled variant: (mean of endpoint-baseline scores) / (pooled SD of baseline and endpoint scores) - Delta variant: (mean of the delta scores) / (SD of the delta scores) (The paper is not explicit about it, but I guess the SMD variant was used for which they could get the data from a given trial) The nominator is the same, but not the denominator: pooled SD between baseline and endpoint is NOT the same as the SD of the change scores. Initially I thought they are probably numerically close enough that the difference is negligible, but then I applied these two ways of calculating SMDs for 3 outcomes of a trial that I happen to have: - Pooled variant SMDs: 0.8 / 0.65 / 0.35 - Delta variant SMDs: 0.62 / 0.37 / 0.84 Some of these differences are certainly not negligible, in the case of the last measure its 0.35 vs 0.84 SMD! That's a difference of ~0.5 SMD! The question is that is it normal / acceptable to mix these two definitions of SMD in a single meta-analysis? I understand the practical difficulty that you can not always extract the data you need for your meta-analysis and therefore compromises / approximations must be taken. However, realizing the large numerical difference these SMD calculations can result in, made me wonder if such meta-analysis is meaningful - effectively you add/subtract up to 0.5 SMD according to which method you use! I would be grateful for comments on the topic and/or links to blogs/youtube/papers that explore this topic. 🙏🙏🙏 #Stats #MetaAnalysis Maybe: @MatthewBJane @stats_tipton @QuantPsychiatry @f2harrell @EikoFried @DFanDaBiasedMan @NaudetFlorian @iainjordan @PloederlM @HengartnerMP @lakens @SolomonKurz


