Frank Klawonn

Longitudinal observation of persistent Long COVID symptoms and health-related quality of life in an adult German cohort

Abstract Background Many individuals experience persistent symptoms following an acute COVID-19 infection, a condition known as Long COVID. The aim of this study was to analyse the prevalence, intensity and longitudinal trajectories of different Long COVID symptoms at baseline an...

The zlog value: a decade of standardizing laboratory results

Abstract Background The zlog transformation was developed in 2016 as a method-independent and unit-independent standardization of laboratory results for the German Electronic Health Record (ePA). Based on the assumption of a log-normal distribution and the known lower and upper r...