I review for a number of journals, including those in the 'BMJ family' but not this journal.
For every review I do, BMJ normally asks for (pretty much mandates) open review which means the authors know who the reviewers are and all the review comments are published. (This is best practice.)
I can't find the reviewers or their comments for this one. I don't know if this journal is an outlier or if I'm looking with my eyes closed.
I like the relative simplicity of the comparators (age, current sex, # of psychiatric appointments prior to inclusion in the cohort/data) but it would have been helpful to see if the reviewers were content with this or had tried to argue for additional or even fewer.
I mention this because I've previously found it inappropriate when studies compared a group of young people with dysphoria with a history of mental perturbation or distress with a general population rather than a group with a comparable history of mental distress but no reported dysphoria.
At the other end of possible analysis, I don't know what granularity of data is available, but I wondered if any reviewers had requested additional stratified analyses. (The authors comment about limitations like this:
Despite the large amounts of data, deaths were rare in our sample, limiting the possibility of more fine-tuned analyses. Moreover, because the register authorities do not allow researchers to track changes in the registered sex, we were not able to run analyses stratified by birth sex, which is a limitation, particularly given the known sex differences in suicide mortality. However, owing to data security and privacy issues, cell frequencies below a certain limit must not be reported. This would have prevented further stratification anyway. )
It's possible some people are criticising the authors for stressing that some differences are not statistically significant and also have high degrees of uncertainty associated with them. However, there are no Rapid Responses as yet… afaict without access to the data, the authors are reporting the data and analysis in a reasonable fashion.
The uncertainty (as in confidence intervals) etc. fall as they do because, thankfully, the absolute rate of suicide is very low.
I hope Prof. Kaltiala discusses this at the upcoming event. It would be interesting to know what concerns anyone who objects to the findings would raise.
In this study, all-cause mortality was predicted through psychiatric treatment, with a higher risk associated with increased treatment needs and the male sex. Psychiatric disorders are associated with increased burdens of somatic illnesses30 and suicide.22 Our findings concord with these past pieces of evidence and show that the first observed difference between the gender-referred group and matched controls in suicide mortality levelled out when psychiatric treatment was considered. In fact, the novel contribution of this study is showing that suicide mortality associates with increased psychiatric needs; this is an important finding if we consider the failure of previous studies on mortality among patients with GD to account for psychiatric morbidities. In light of our findings, experiencing GD significant enough to seek GR appears to not be associated with increased suicide mortality, but suicides appear to be explained by psychiatric morbidities.
…
Most importantly, when psychiatric treatment needs, sex, birth year and differences in follow-up times were accounted for, the suicide mortality of both those who proceeded and did not proceed to GR did not statistically significantly differ from that of controls. This does not support the claims5 6 that GR is necessary in order to prevent suicide. GR has also not been shown to reduce even suicidal ideation7 8, and suicidal ideation is not equal to actual suicide risk.29 To the best of our knowledge, the impact of GR on suicide mortality among gender-referred adolescents has not been reported in earlier studies. In an earlier study by Dhejne et al,11 even when psychiatric morbidity was controlled for, participants diagnosed as transsexual in adulthood who had undergone both hormonal and surgical GR displayed increased suicide mortality compared with matched population controls. Nonetheless, these authors focused on patients treated before 2002. More recent cohorts, particularly adolescents, may differ from those in earlier decades, and stress related to gender identity itself may be lower presently because of decreasing prejudice.