title: Validation study of the Chinese version of the Illness Intrusiveness Ratings Scale.
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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Cancer Institute and Hospital, Tianjin Medical University, Tianjin, China. liweiliwei810821@yahoo.com.cn
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Kexin
authors.initials: K
authors.lastname: Chen
authors.forename: Beth
authors.initials: B
authors.lastname: Halfyard
authors.forename: Biyun
authors.initials: B
authors.lastname: Qian
authors.forename: Haixin
authors.initials: H
authors.lastname: Li
authors.forename: Peizhong Peter
authors.initials: PP
authors.lastname: Wang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003431:Cross-Cultural Comparison; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D007297:Inpatients / Q000523:psychology* / Q000706:statistics & numerical data; D008019:Life Style; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000523:psychology*; D025341:Principal Component Analysis; D011594:Psychometrics; D011788:Quality of Life / Q000523:psychology*; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires