Publication: Validity, reliability and interpretability of the Thai version of the urticaria control test (UCT)
Issued Date
2016
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eng
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Mahidol University
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BioMed Central
Bibliographic Citation
Health and Quality of Life Outcomes. Vol. 14, (2016), 61
Suggested Citation
Kanokvalai Kulthanan, Leena Chularojanamontri, Papapit Tuchinda, Chuda Rujitharanawong, Maurer, Marcus, Weller, Karsten Validity, reliability and interpretability of the Thai version of the urticaria control test (UCT). Health and Quality of Life Outcomes. Vol. 14, (2016), 61. doi:10.1186/s12955-016-0466-y Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/2681
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Title
Validity, reliability and interpretability of the Thai version of the urticaria control test (UCT)
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Abstract
Background: The Long Form and Short Form of the German (original) version of the Urticaria Control Test (UCT)
have shown to be valid and reliable instruments for assessing patients with all types of chronic urticaria (CU). The
cutoff scores for identifying patients with well-controlled disease were ≥ 24 and ≥ 12 for Long and Short Forms,
respectively. However, the sensitivity to change and minimal clinically important difference (MCID) of the UCT have
never been systematically evaluated. This study aimed to investigate the validity, reliability, screening accuracy,
sensitivity to change and MCID of the linguistically validated translation of the UCT into the Thai language for
assessing CU in the Thai population.
Methods: A structured translation and pre-testing were done to cross-culturally adapt the UCT for the Thai
language. All measurement properties of both forms of the Thai UCT were validated in 169 patients with CU.
Results: There were strong correlations between the Thai UCT score and disease activity, health-related quality of
life impairment, and disease control (all correlations ≥ 0.7). Good internal consistency and excellent intra-rater
reliability were demonstrated. The same cutoff scores to define patients with well-controlled disease should be
used as those recommended for the original UCT version. MCIDs equated to increase in scores of 6 and 3 for the
Long and Short Forms, respectively, of the Thai UCT should be used to identify patients who had minimal
responses. Score increments of ≥10 and ≥ 6 for Long and Short Forms, respectively, should be used to define
patients who had marked responses.
Conclusions: This study confirmed the applicability of the UCT for use in Thailand, a country that has a very
different language and cultural setting than that of Germany and the United States. Further studies are required to
examine the suitability of the UCT for use in the pediatric population.