Persian version of thirst distress scale (TDS) in patients on hemodialysis: Factor structure and psychometric properties .

Background: Patients on hemodialysis can experience thirst distress. However, there is no valid and reliable Persian instrument to measure this condition in such patients. The present study aims to determine the psychometric properties of the Persian version of the thirst distress scale (TDS) for patients on hemodialysis.

Materials And Methods: Our sample consisted of 142 hemodialysis patients completed the TDS Persian version. The face, content, and construct validity of the scale were ascertained. Reliability was also assessed using internal consistency, construct reliability, and intra-class correlation coefficient (ICC).

Results: Construct validity determined one factor with an eigenvalue greater than 0.7. The model revealed good fitness (χ (121, N = 142) = 269.32, p < 0.001; χdf = 2.225, goodness of fit index (GFI) = 0.912, normed fit index (NFI) = 0.866, comparative fit index (CFI) = 0.926, incremental fit index (IFI) = 0.961, and root mean square error of approximation (RMSEA) = 0.089 (90% confidence interval = 0.069 - 0.109)). The internal consistency, construct reliability, and ICC were greater than 0.70. The scale's convergent validity was demonstrated.

Conclusion: This study confirmed the acceptable psychometric properties and the factor structure of the TDS in Iranian patients on hemodialysis.
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