The Kidney Transplant Questionnaire (KTQ) is a quality-of-life instrument designed specifically for renal transplant recipients.
The purpose of this work was to evaluate the validity and reliability of a Persian translation of the KTQ-25 questionnaire as a tool for use in Iran and also to compare the quality of life between dialysis and transplant patients.
We collected 143 subjects in a cross-sectional study. Their mean age was 40.3±13.3 years (range=15-72). All KDQ-25 scales met the criteria for internal consistency(Cronbach's alpha ranged from 0.8-0.95) and in construct validity, the correlation coefficient between 5 scales and the total scale was also acceptable (0.84-0.91). Furthermore, significant correlations were detected between the scales (P<.001).
The mean total score was 2.8±1.4 (range=5.8-1.5). The best mean score observed in uncertainty and fear item was 3.1±1.6 (range=0.5-7), while the lowest was detected in the emotional item, 2.4±1.3 (range=0.17-6). Mean follow-up was 50.1 (range=1-264) months. The most common physical problem was aching, tired legs in 77 (55%) subjects.In comparison between dialysis and transplant patients using the standard Iranian version of Kidney Disease Quality of Life (KDQOL) questionnaire, the total and disease-specific scores for dialysis patients were significantly better than the total score in the KDQ-25 (55.8±14 vs 40.7±20.2, P=.000) and (49.7±15.8 vs 40.7±20.2, P=.000), respectively.
Considering its validity and reliability, the Persian version of KTQ-25 questionnaire may be useful to assess the health-related quality of life among Iranian transplant recipients.
[Show abstract][Hide abstract] ABSTRACT: Valid instrumentation in the assessment of health-related quality of life (HQoL) in renal transplant recipients is critical to identifying particular nuances and determinants of HQoL in this population. Therefore, the validity of disease-specific instruments to measure HQoL in renal transplant recipients, such as the Kidney Transplant Questionnaire (KTQ), needs further investigation. The objective of this study was to assess the concurrent validity of the KTQ in adult US renal transplant recipients using the well established SF-12 Health Survey version 2 (SF-12v2) as the comparison instrument.
One hundred and fourteen renal transplant recipients met the following inclusion criteria for this study, ie, were at least 21 years of age, more than two years post-transplant, and receiving immunosuppressant therapy. Subjects were asked to complete a series of HQoL instruments, ie, the KTQ and the SF-12v2 (physical component summary [PCS-12] and mental component summary [MCS-12]). Descriptive statistics were calculated, and correlational analyses were conducted to examine the concurrent validity of the HQoL instruments.
Among 100 participants (87.7% response rate), the majority of participants were male (52%), had deceased donor transplants (63%), and received Medicare benefits (84%). PCS-12 was positively correlated with three of five KTQ subscales (P < 0.05), ie, KTQ-physical (r = 0.43), KTQ-fatigue (r = 0.42), and KTQ-uncertainty/fear (r = 0.2). MCS-12 was positively correlated with all KTQ subscales (P < 0.01), ie, KTQ-physical (r = 0.26), KTQ-fatigue (r = 0.48), KTQ-uncertainty/fear (r = 0.33), KTQ-emotional (r = 0.47), and KTQ-appearance (r = 0.28).
The findings support the concurrent validity of the KTQ in US renal transplant recipients. Future studies should continue exploring the validity of the KTQ, as well as its practical and research utility in HQoL measurement in the renal transplant population.
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