Validity and Reliability of The Turkish Version of the Stanford Proxy Test for Delirium

Aim: The aim of this study was to perform a Turkish validation of the Stanford proxy test for delirium (S-PTDTV). Materials and Methods: The original English version of the S-PTD was translated into Turkish using forward-backward translation methods. The Turkish version S-PTDTV was then administered by experienced nurses to elderly patients in an intensive care unit (ICU). The validation process involved assessing the sensitivity and specificity of the S-PTDTV by comparing its results with delirium diagnoses based on the diagnostic and statistical manual of mental disorders, fifth edition (DSM-5) and the confusion assessment method for the ICU (CAM-ICU). Reliability was assessed using internal consistency, intra-rater, and inter-rater reliability analyses. Results: A total of 102 patients (50% female, mean age 74±9 years) participated in the study. When the cut-off score for the Turkish S-PTD was set at 7 points, the test showed a sensitivity of 96.6% and a specificity of 94.4% for the detection of delirium (area under the curve=0.985, p<0.001). High agreement was observed between S-PTD scores and both DSM-5 (κ=0.885, p<0.001) and CAM-ICU (κ=0.932, p<0.001). In addition, reliability analyses showed high consistency for both inter-rater [intraclass correlation coefficient (ICC=0.993, p<0.001)] and intra-rater (ICC=0.996, p<0.001) ratings. Internal consistency was also high, with a Cronbach’s alpha of 0.914. Conclusion: The results of this study indicate that the Turkish version of the S-PTD is a valid and reliable tool for the diagnosis of delirium in elderly ICU patients.