Adherence to dietary restriction of phosphorus intake
Adherence to DRPI was measured by the researcher-made Dietary Restriction of Phosphorus Intake Scale (DRPI-S), which was also developed by the researchers based on scientific sources [Dietary restriction of phosphorus intake scaleThe validity and reliability of this tool were established in the same way as described for the Phosphate Control Knowledge Scale. All items of this tool earned CVR and CVI scores of more than 0.62 and 0.96, respectively, which confirmed their necessity and relevance. The tool’s intra-class correlation coefficient and Cronbach’s alpha were determined to be 0.91 and 0.83, respectively, which confirmed the reliability of the tool [