title: Factor structures of the Swedish Version of the RFIPC: Investigating the Validity of Measurements of IBD Patients' Worries and Concerns.
abstract: BACKGROUND
  Worries and concerns of patients with IBD comprise an important negative factor in their HRQOL. The Rating Form of Inflammatory Bowel Disease Patient Concerns (RFIPC) was developed to describe the nature and degree of the worries and concerns of IBD patients. In the original version, the specific issues of worries are divided into four separate factors. These factors provide useful information about HRQOL and the kind of worries and concerns which are most important to the patient. However, the Swedish version of the RFIPC is often scored using a single sum score, implying that all the specific issues of worries stem from a single general worry factor. The aim of this study was to validate the factor structure of the Swedish version of the RFIPC.
  
  
  METHODS
  A sample consisting of 195 patients with IBD filled out the RFIPC. Confirmatory factor analysis was performed to examine fit of three hypothesized models of factor structure. Spearman's correlation and Mann-Whitney analysis were used to follow up the results.
  
  
  RESULTS
  The single-factor model displayed poor fit indices. The four-factor model marked substantive improvement, but still remains inadequate. The final four-factor model permitting correlated error terms between some items displayed the most adequate fit.
  
  
  CONCLUSIONS
  The factorial structure of the RFIPC, as suggested in the original version, was able to be replicated with a slight modification in the Swedish version. The separate factors identified in this structure provide more detailed information about the worries and concerns of IBD patients as these components of worries are different related to HRQOL and general health.
authors.affiliation: Karolinska Institutet, Department of Clinical Sciences, Danderyd Hospital, Division of Medicine, SE-182 88 Stockholm, Sweden.
authors.forename: Susanna
authors.initials: S
authors.lastname: Jaghult
authors.affiliation: Karolinska Institutet, Department of Clinical Sciences, Danderyd Hospital, Division of Medicine, SE-182 88 Stockholm, Sweden; Sophiahemmet University College, Box 5605, SE-114 86 Stockholm, Sweden.
authors.forename: Fredrik
authors.initials: F
authors.lastname: Saboonchi
authors.affiliation: Karolinska Institutet, Department of Clinical Sciences, Danderyd Hospital, Division of Medicine, SE-182 88 Stockholm, Sweden; Sophiahemmet University College, Box 5605, SE-114 86 Stockholm, Sweden.
authors.forename: Unn-Britt
authors.initials: UB
authors.lastname: Johansson
authors.affiliation: Karolinska Institutet, Department of Clinical Sciences, Danderyd Hospital, Division of Medicine, SE-182 88 Stockholm, Sweden.
authors.forename: Regina
authors.initials: R
authors.lastname: Wredling
authors.affiliation: Karolinska Institutet, Department of Clinical Sciences, Danderyd Hospital, Division of Medicine, SE-182 88 Stockholm, Sweden.
authors.forename: Marjo
authors.initials: M
authors.lastname: Kapraali
keywords: Concern; Crohn’s disease; Health-related quality of life; Inflammatory bowel disease; Ulcerative colitis; Worry