Validity and reliability of Polish adaptation of Yale Global Tic Severity Scale (YGTSS) in a study of Warsaw schoolchildren aged 12-15

This publication was part of my PhD project. I summarises the validation study of a new adaptation of a scale to measure severity of tic disorders. Before we adapted the scale we contacted the authors who answered rapidly and granted permission to adapt the scale to Polish conditions. We used the scale in our epidemiological study of Warsaw schoolchildren and hopefully it was further used in clinical practice :)