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Validation study of the Chinese version of the Illness Intrusiveness Ratings Scale
Authors:Li Wei  Chen Kexin  Halfyard Beth  Qian Biyun  Li Haixin  Wang Peizhong Peter
Institution:
  • a Cancer Institute and Hospital, Tianjin Medical University, Tianjin, China
  • b Tianjin Center of Disease Control and Prevention, Tianjin, China
  • c Division of Community Health and Humanities, Faculty of Medicine, Memorial University of Newfoundland, St. John's, Canada
  • d School of Public Health, Tianjin Medical University, Tianjin, China
  • Abstract:

    Objective

    The Illness Intrusiveness Ratings Scale (IIRS) measures illness-induced disruptions to 13 different aspects of lifestyles, activities, and interests. A stable three-factor structure has been well documented in studies conducted in Western countries. However, in Asia, the general validity of this scale has not been examined.

    Methods

    This study investigated the factor structure of the Chinese version of the IIRS in 641 inpatients at a Chinese hospital for cancer patients. The European Organization for the Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30) was also administered and compared with the IIRS.

    Results

    Exploratory principal component analysis identified a two-factor structure, “health and living” and “relationships and personal development”, which accounted for 58.65% of the total variance. A “goodness-of-fit” test supported a two-factor solution (P=.070). The IIRS was significantly correlated with scores of every scale in the EORTC QLQ-C30.

    Conclusion

    These findings support the validity of the Chinese version of the IIRS but did not support a cross-cultural equivalence of the factor structure. This study was only performed in hospitalized cancer patients; therefore, further evaluation involving patients with other diseases is warranted.
    Keywords:Illness Intrusiveness Ratings Scale  Chinese version  HRQOL  Factor analysis  Validity reliability
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