Validation study of the Chinese version of the Illness Intrusiveness Ratings Scale

Li, Wei; Chen, Kexin; Halfyard, Beth; Qian, Biyun; Li, Haixin; Wang, Peizhong Peter

doi:10.1016/j.jpsychores.2010.05.008

« Previous Next »Journal of Psychosomatic Research
Volume 70, Issue 1 , Pages 67-72, January 2011

Validation study of the Chinese version of the Illness Intrusiveness Ratings Scale

Wei Li
- Cancer Institute and Hospital, Tianjin Medical University, Tianjin, China
- Tianjin Center of Disease Control and Prevention, Tianjin, China
- Corresponding authors. Division of Community Health and Humanities, Faculty of Medicine, Memorial University of Newfoundland, St. John's NL, Canada A1B 3V6. Tel.: +1 709 777 6666; fax: +1 709 777 7382.
Kexin Chen
- Cancer Institute and Hospital, Tianjin Medical University, Tianjin, China
Beth Halfyard
- Division of Community Health and Humanities, Faculty of Medicine, Memorial University of Newfoundland, St. John's, Canada
Biyun Qian
- Cancer Institute and Hospital, Tianjin Medical University, Tianjin, China
Haixin Li
- Cancer Institute and Hospital, Tianjin Medical University, Tianjin, China
Peizhong Peter Wang
- Cancer Institute and Hospital, Tianjin Medical University, Tianjin, China
- Division of Community Health and Humanities, Faculty of Medicine, Memorial University of Newfoundland, St. John's, Canada
- School of Public Health, Tianjin Medical University, Tianjin, China
- Corresponding authors. Division of Community Health and Humanities, Faculty of Medicine, Memorial University of Newfoundland, St. John's NL, Canada A1B 3V6. Tel.: +1 709 777 6666; fax: +1 709 777 7382.

Received 7 September 2007; received in revised form 6 May 2010; accepted 11 May 2010. published online 12 July 2010.

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