GPT and psoriatic arthritis: By applying Lasso penalized Cox proportional hazards regression to the baseline data, ALT, psoriatic arthritis diagnosis, and the use of csDMARD other than methotrexate or sulfasalazine were identified as the strongest predictors of subsequent ALT elevations reaching together a concordance index of 0.71 (95% CI 0.60–0.82) in the test cohort.