Psychometric testing of the Impact of Event Scale-Chinese Version (IES-C) in oral cancer patients in Taiwan.
OBJECTIVE
No culturally relevant instrument exists to assess the impact of cancer on patients in Taiwan. Therefore, this two-phase study was undertaken to (1) develop a Chinese version of the Impact of Event Scale (IES), (2) examine its psychometric properties, and (3) use the IES-Chinese version (IES-C) to assess the impact of cancer in newly diagnosed oral cancer patients in Taiwan.


METHODS
The psychometric properties of the 15-item IES-C were tested in 106 newly diagnosed oral cancer patients and analyzed by descriptive statistics, test-retest reliability, Pearson's correlation, and principal component analysis.


RESULTS
The results showed that (1) the IES-C has satisfactory content validity and feasibility; (2) overall internal consistency (Cronbach's alpha) was 0.91 with values of 0.91 and 0.81 for intrusion and avoidance, respectively; (3) overall test-retest reliability (3-day interval) was 0.97; (4) two clearly identified factors explained 55.97% of the variance; (5) satisfactory construct validity was supported by both factor analysis and theoretically supported correlation analysis (significant correlations between the total IES-C and its subscales as well as anxiety and depression); and (6) oral cancer patients had relatively higher IES-C scores than previously reported.


CONCLUSIONS
These results support the IES-C as an instrument with satisfactory psychometric properties and ease of use in clinical settings. They also suggest that more attention should be paid to the impact on patients of a new diagnosis of oral cancer. Further testing of the IES-C in different cancer populations is suggested to validate its psychometric properties.
Chen
Shu-Ching
SC
Graduate Institute of Medical Sciences, College of Medicine, Taipei Medical University, 250 Wu-Hsing Street, Taipei 110, Taiwan.
Lai
Yeur-Hur
YH
Liao
Chun-Ta
CT
Lin
Chia-Chin
CC
D000328:Adult; D000368:Aged; D001007:Anxiety; D003863:Depression; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000208:ethnology* / Q000523:psychology*; D011569:Psychiatric Status Rating Scales; D011594:Psychometrics; D011788:Quality of Life; D013624:Taiwan / Q000208:ethnology
Radiother Oncol. 1993 Jun;27(3):193-7
7692472
Patient Educ Couns. 1996 Jul;28(2):209-19
8852096
J Adv Nurs. 2000 Oct;32(4):944-51
11095234
BJU Int. 2002 Jul;90(1):56-61
12081771
Cancer Treat Rep. 1986 Dec;70(12):1423-9
3539328
Psychooncology. 2001 Nov-Dec;10(6):459-68
11747058
Community Genet. 2003;6(4):235-41
15331869
Soc Sci Med. 2002 Sep;55(5):721-32
12190266
Am J Med Genet. 2001 Oct 15;103(3):188-92
11745989
Semin Oncol. 1988 Feb;15(1):61-9
3344444
Br J Med Psychol. 1995 Dec;68 ( Pt 4):333-40
8688372
Psychooncology. 2001 Nov-Dec;10(6):511-20
11747063
Acta Psychiatr Scand. 1983 Jun;67(6):361-70
6880820
Br J Cancer. 1993 Apr;67(4):773-5
8471434
Psychosom Med. 1979 May;41(3):209-18
472086
Nurs Res. 1988 Mar-Apr;37(2):98-103, 127
3347527
Br J Psychiatry. 2002 Mar;180:205-9
11872511
Am J Clin Oncol. 1982 Dec;5(6):649-55
7165009
Psychosom Med. 1994 Nov-Dec;56(6):526-32
7871108
Otolaryngol Head Neck Surg. 1999 Mar;120(3):427-36
10064650
Br J Clin Psychol. 1993 Sep;32 ( Pt 3):327-31
8251963
J Trauma Stress. 2000 Jan;13(1):101-13
10761177
Eur J Cancer. 1996 Jun;32A(7):1135-41
8758243
Ann Behav Med. 1997 Fall;19(4):362-9
9706363
Clin Otolaryngol Allied Sci. 1986 Dec;11(6):469-74
3545557
Eur J Cancer. 1992;28A(8-9):1328-30
1515244
Health Psychol. 1997 Jan;16(1):63-72
9028816
J Consult Clin Psychol. 1982 Jun;50(3):407-14
7096742
Psychosom Med. 2003 Sep-Oct;65(5):870-6
14508034
Eur J Cancer Care (Engl). 2002 Mar;11(1):6-15
11966830
J Consult Clin Psychol. 1986 Jun;54(3):303-8
3722557
Gen Hosp Psychiatry. 1995 Mar;17(2):126-34
7789783