Propensity score-based inverse probability of treatment weighting shows that efficacy may differ between tofacitinib and baricitinib. Miyazaki, et al. compared the efficacy and safety of the two JAK inhibitors in real-world clinical practice, after reduction to a minimum of the selection bias, using propensity score-based inverse probability of treatment weighting, and adjustment for confounding patient characteristics. They found that tofacitinib may be less effective in patients resistant to m...