Development and psychometric validation of an instrument to assess knowledge of the aetiology, prevention and treatment of venous leg ulcers in undergraduate nursing students.

The following section reflect the stage of development and validation of the instrument: psychometric evaluation. In the latter, the classical analysis of the items, the analysis of the psychometric properties according to the Rasch model and differential analysis of item functioning (DIF), analysis of construct validity by means of hypothesis testing in known groups and analysis of reliability by internal consistency were carried out.