Development and Validation of the Knowledge of Dietary Sodium Reduction Scale
Pratsani Srikan, PhD, RN
Kenneth D. Phillips, PhD, RN

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Abstract: The objective of this research was to develop and validate the psychometric properties of the Knowledge of Dietary Sodium Reduction (KDSR) scale because no scale is available that is culturally fit for measuring that knowledge. A 16-item self-reported KDSR scale was developed and tested in 242 hypertensive older adults in northern Thailand. Its psychometric properties were validated with factor composition, Rasch Analysis, and reliability. The results were a 12-item KDSR version with a one-factor solution was accepted with an Eigenvalue of 4.84. The scale's unidimensionality was also supported by showing the infit and outfit mean square between 0.60 and 1.40 for total scale. Its rating scale and difficulty were evaluated and showed acceptable outcomes. Cronbach's alpha was 0.80. This scale is short, reliable, and is now ready for health research and clinical usage. However, it needs to be tailored for appropriateness with certain populations, lifestyles, culinary styles, culture, and contexts.

Keywords: Factor analysis, hypertensive, knowledge, older adults, Rasch analysis, salt reduction

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