title: "The impact of cancer scale" version 1: psychometric testing of the Norwegian translation in a heterogeneous sample of cancer survivors.
abstract: OBJECTIVE
  The impact of cancer scale version 1 (IOC-1) from 2006 has only been tested psychometrically in a heterogeneous sample of 193 American long-term cancer survivors (LTSs). The Norwegian version of IOC-1 compares the psychometric findings of that study with those observed in a heterogeneous sample of 809 Norwegian LTSs.
  
  
  METHODS
  We performed exploratory (EFA) and confirmatory (CFA) factor analyses, tests of internal consistency, correlational studies with various other tests and a change over time examination in order to test reliability and validity of the IOC-1.
  
  
  RESULTS
  The American factor structure of the IOC-1 with 10 dimensions showed adequate fit with CFA in the Norwegian sample, but internal consistency was insufficient in 2 dimensions. EFA of the Norwegian sample found a 9 factor solution that also showed adequate fit on CFA, and with sufficient internal consistencies for all dimensions. The SF-36 dimensions, anxiety, depression, neuroticism, fatigue and body image all showed low correlations with the positive dimensions of the IOC-1, but higher correlations with the IOC-1 negative dimensions. The IOC-1 dimensions showed considerable stability over time.
  
  
  CONCLUSIONS
  In our big heterogeneous sample of LTSs, the Norwegian version of the IOC-1 showed discriminant and concurrent validity, and reliability was supported.
authors: Department of Oncology, Oslo University Hospital, Radiumhospitalet, Postboks 4953, Nydalen, 0424, Oslo, Norway. a.a.dahl@imbv.uio.no
authors: Alv A
authors: AA
authors: Dahl
authors: Saevar Berg
authors: SB
authors: Gudbergsson
authors: Anne
authors: A
authors: Dørum
authors: Sophie D
authors: SD
authors: Fosså
authors: Astrid H
authors: AH
authors: Liavaag
authors: Øystein
authors: Ø
authors: Sørebø
mesh_terms: D000223:Adaptation, Psychological; D001007:Anxiety / Q000523:psychology; D001828:Body Image; D005163:Factor Analysis, Statistical; D005221:Fatigue / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000523:psychology*; D011594:Psychometrics; D013315:Stress, Psychological; D011795:Surveys and Questionnaires; D017741:Survivors / Q000523:psychology*