Prediction models for diagnosis and prognosis of covid-19: systematic review and critical appraisal

Please see this living systematic review and critical appraisal of various prediction models to diagnose covid-19 in suspected patients.
With over 60 prediction models being assessed in the review so far, this review indicates that proposed models are poorly reported, at high risk of bias, and their reported performance is probably optimistic.

https://www.bmj.com/content/369/bmj.m1328