J Korean Med Sci.  2005 Apr;20(2):302-306. 10.3346/jkms.2005.20.2.302.

Factor Structure of the Korean Version of Illness Intrusiveness Rating Scale: Cross-cultural Implications

  • 1Department of Neuropsychiatry, College of Medicine, Hanyang University, Seoul, Korea.
  • 2Department of Neuropsychiatry, Hanyang University Guri Hospital, Guri, Korea. dkim9289@ihanyang.ac.kr
  • 3Kim's Neuropsychiatric Clinic, Seoul, Korea.


The Illness Intrusiveness Rating Scale (IIRS) measures illness-induced disruptions to 13 domains of lifestyles, activities, and interests. A stable three-factor structure has been well documented; however, the cross-cultural validity of this scale needs to be tested. This study investigated the factor structure of the Korean version of IIRS in 712 outpatients at a university medical center. A predominant diagnosis of the patients was rheumatoid arthritis (47%). The Center for Epidemiological Studies-Depression Scale (CES-D), and Health Assessment Questionnaire (HAQ) were also administered. Exploratory Principal Component Analysis identified a two-factor structure, "Relationships and Personal Development (RPD)" and "Instrumen-tal", accounting for 57% of the variance. Confirmatory analyses extracted an identical factor structure. However, a goodness-of-the fit test failed to support two-factor solution (X2 =138.2, df=43, p<.001). Two factors had high internal consistency (RPD, alpha=.89; Instrumental, alpha=.75) and significantly correlated with scores of HAQ (RPD, r=.53, p<.001; Instrumental, .r=44, p<.001) and CES-D (RPD, .r=55, p<.001; Instrumental, .r=43, p<.001). These findings supported construct validity of the Korean version of IIRS, but did not support cross-cultural equivalence of the factor structure.


Cross-cultural Comparison; Reproducibility of Results; Validity; Factor Analysis, Statistical; Psy-chiatric Status Rating Scales

MeSH Terms

Asian Continental Ancestry Group
*Cross-Cultural Comparison
Factor Analysis, Statistical
Middle Aged
Reproducibility of Results
*Sickness Impact Profile
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