Validation of a Korean Version of the Insomnia Severity Index
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초록
Background and Purpose The purposes of this study were to standardize and validate aKorean version of the Insomnia Severity Index (ISI-K), and to evaluate its clinical usefulness. Methods We translated the ISI into Korean and then translated it back into English to checkits accuracy. The 614 patients with sleep disorders who were enrolled in this study comprised 169with primary insomnia, 133 with comorbid insomnia, and 312 with obstructive sleep apnea. Allsubjects underwent one night of polysomnography (PSG) and completed the Korean versionsof both the Pittsburgh Sleep Quality Index (PSQI-K) and the Epworth Sleepiness Scale, as wellas the ISI-K. The ISI-K was compared to these sleep scales and various PSG sleep parameters. Results The internal consistency the ISI-K total score was confirmed by a Cronbach’s alphaof 0.92, and the item-to-total-score correlations (item-total correlations) ranged from 0.65 to0.84, suggesting adequate reliability. The correlation between the ISI-K total score and PSQI-Kwas 0.84, which suggested adequate convergent validity. Low-to-moderate correlations wereobtained between the ISI-K total score and PSG-defined sleep parameters: 0.22 for sleep onsetlatency, 0.38 for wake after sleep onset, and 0.46 for sleep efficiency. A cutoff score of 15.5 onthe ISI-K was optimal for discriminating patients with insomnia. The test-retest scores over a4-week interval with 34 subjects yielded a correlation coefficient of 0.86, suggesting excellenttemporal stability. Conclusions The findings of this study show that the ISI-K is a reliable and valid instrument forassessing the severity of insomnia in a Korean population.
Abstract
Background and Purpose The purposes of this study were to standardize and validate aKorean version of the Insomnia Severity Index (ISI-K), and to evaluate its clinical usefulness. Methods We translated the ISI into Korean and then translated it back into English to checkits accuracy. The 614 patients with sleep disorders who were enrolled in this study comprised 169with primary insomnia, 133 with comorbid insomnia, and 312 with obstructive sleep apnea. Allsubjects underwent one night of polysomnography (PSG) and completed the Korean versionsof both the Pittsburgh Sleep Quality Index (PSQI-K) and the Epworth Sleepiness Scale, as wellas the ISI-K. The ISI-K was compared to these sleep scales and various PSG sleep parameters. Results The internal consistency the ISI-K total score was confirmed by a Cronbach’s alphaof 0.92, and the item-to-total-score correlations (item-total correlations) ranged from 0.65 to0.84, suggesting adequate reliability. The correlation between the ISI-K total score and PSQI-Kwas 0.84, which suggested adequate convergent validity. Low-to-moderate correlations wereobtained between the ISI-K total score and PSG-defined sleep parameters: 0.22 for sleep onsetlatency, 0.38 for wake after sleep onset, and 0.46 for sleep efficiency. A cutoff score of 15.5 onthe ISI-K was optimal for discriminating patients with insomnia. The test-retest scores over a4-week interval with 34 subjects yielded a correlation coefficient of 0.86, suggesting excellenttemporal stability. Conclusions The findings of this study show that the ISI-K is a reliable and valid instrument forassessing the severity of insomnia in a Korean population.
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