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Saturday, 22 October 2005
28

RATING SCALE, STANDARD GAMBLE, AND TIME TRADEOFF FOR PERSONS WITH TRAUMATIC SPINAL CORD INJURIES

Mau-Roung Lin, PhD1, Hei-Fen Hwang, MS2, Kuo-Piao Chung, PhD3, Chingchaw Huang, PhD2, and Chih-Yi Chen, MS1. (1) Taipei Medical University, Taipei, Taiwan, (2) National Taipei College of Nursing, Taipei, Taiwan, (3) National Taiwan University, Taipei, Taiwan

Purpose: To our knowledge, the rating scale (RS), standard gamble (SG), and time tradeoff (TTO) have not been reported for persons with traumatic spinal cord injuries (SCIs). This study compared psychometric performances of these preference-based measures among people with SCIs in Taiwan. Methods: In total, 187 SCI subjects from a nationwide registry of traumatic SCIs were interviewed by telephone. Score distributions, interrater reliability, discriminant ability, and convergent validity of the RS, SG, and TTO were compared. Results: The mean (median) values of the RS, SG, and TTO were 0.67 (0.70), 0.64 (0.75), and 0.53 (0.50), respectively, and their corresponding intraclass correlation coefficients of intrarater and interrater test-retest reliability were 0.92 and 0.89, 0.78 and 0.73, and 0.91 and 0.78. Compared with the SG and TTO, the RS had fewer floor and ceiling values as well as percent changes, more missing observations, a larger effect size, and better discrimination ability. The results of Spearman's correlation coefficient and factor analysis showed that the SG strongly converged with the TTO (r = 0.65, and in a single common factor), but they weakly converged with the RS (r = 0.33 with the SG and r = 0.27 with the TTO). In the linear regression models, the RS was significantly associated with neurological severity, employment, educational level, and self-care ability; the SG was associated with neurological severity and employment; and the TTO was only associated with neurological severity. Conclusions: The RS generally performed better than the SG and TTO among persons with traumatic SCIs; however, the underlying construct measured by the RS differed considerably from those measured by the SG and TTO.

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