Validation of a Symptoms Distress Scale in a Cirrhotic Population Using Item Response Theory

Nursing Research
Hui-Chuan HuangKuan-Chia Lin

Abstract

The assessment of symptoms distress is an important strategy for symptoms management and treatment of patients with liver cirrhosis (LC); however, appropriate instruments are limited. The objective of this study was to validate a symptoms distress scale (SDS) by confirming the appropriateness of each item using item response theory. A cross-sectional and convenience sampling was conducted to recruit eligible cirrhotic outpatients from the gastroenterology outpatient department of a single medical university hospital. In total, 163 patients with LC completed the 21-item SDS. A graded response model with two-parameter (discrimination and difficulty) estimation was used for data analysis. The item response theory model identified the validity of the SDS and found that most of the items in the SDS represented a high level of symptoms distress; moreover, three items of bruising, drowsiness, and dark urine were reported in cirrhotic patients with severe symptom distress. Four items comprising bodily pain, right upper quadrant pain, muscle cramps, and change in appearance can be appropriately represented in cirrhotic patients with mild symptoms distress. Moreover, the amount of test information in the SDS was >0.70, indicating accepta...Continue Reading

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