Background Postacute sequelae of severe acute respiratory syndrome coronavirus 2 (SARS-
CoV-2) infection (PASC) can affect many organ systems. However, temporal changes during …

The acute clinical manifestations of COVID-19 have been well characterized,, but the post-
acute sequelae of this disease have not been comprehensively described. Here we use the …

In the causal analysis of observational data, the positivity assumption requires that all
treatments of interest be observed in every patient subgroup. Violations of this assumption …

Background Randomised clinical trials showed that compared with placebo, SGLT2
inhibitors and GLP-1 receptor agonists reduced risk of adverse cardiovascular events. The …

We study regressions with multiple treatments and a set of controls that is flexible enough to
purge omitted variable bias. We show these regressions generally fail to estimate convex …

Population‐adjusted indirect comparisons estimate treatment effects when access to
individual patient data is limited and there are cross‐trial differences in effect modifiers …

Most reported treatment effects in medical research studies are ambiguously defined, which
can lead to misinterpretation of study results. This is because most authors do not attempt to …

Propensity score weighting methods are often used in non-randomized studies to adjust for
confounding and assess treatment effects. The most popular among them, the inverse …

Chemotherapy is generally considered as the main treatment for metastatic gastric
adenocarcinoma. The role of gastrectomy for metastatic gastric cancer without obvious …

We used Monte Carlo simulations to compare the performance of asymptotic variance
estimators to that of the bootstrap when estimating standard errors of differences in means …