title: A 7-day recall period for a clinical application of the oral health impact profile questionnaire.
abstract: OBJECTIVE
  Aims were to investigate and compare the validity and reliability of Oral Health Impact Profile (OHIP) scores referencing 7-day and 1-month recall periods in international prosthodontic patients.
  
  
  METHODS
  A sample of 267 patients (mean age = 54.0 years, SD = 17.2 years, 58 % women) with stable oral health-related quality of life was recruited from prosthodontic treatment centers in Croatia, Germany, Hungary, Japan, Slovenia, and Sweden. These patients completed the OHIP on two occasions using a new 7-day recall period and the traditional 1-month recall period. OHIP score validity and reliability were investigated with structural equation models (SEMs) that included OHIP(past 7 days) and OHIP(1 month) latent factors and single indicator measures of global oral health status. The SEMs assessed measurement invariance and the relative validities of the two OHIP latent factors (representing the two recall periods).
  
  
  RESULTS
  The SEMs provided cogent evidence for recall period measurement invariance for the two OHIP forms and equal validities (r = .48) with external measures of global oral health status.
  
  
  CONCLUSIONS
  When assessed in international prosthodontic patients, OHIP scores using the new 7-day recall period were as reliable and valid as the scores using the 1-month recall period.
  
  
  CONCLUSIONS
  Conceptual advantages make a 7-day recall period a preferred frame of reference in clinical applications of the OHIP questionnaire.
authors.affiliation: Department of Psychology, University of Minnesota, N657 Elliott Hall, 75 East River Road, Minneapolis, MN, 55455, USA. nwaller@umn.edu.
authors.forename: Niels
authors.initials: N
authors.lastname: Waller
authors.affiliation: Department of Diagnostic and Biological Sciences, School of Dentistry, University of Minnesota, Minneapolis, MN, USA.
authors.forename: Mike T
authors.initials: MT
authors.lastname: John
authors.affiliation: Department of Psychology, University of Minnesota, N657 Elliott Hall, 75 East River Road, Minneapolis, MN, 55455, USA.
authors.forename: Leah
authors.initials: L
authors.lastname: Feuerstahler
authors.affiliation: Department of Prosthodontics, Showa University, Tokyo, Japan.
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Baba
authors.affiliation: Centre of Oral Rehabilitation, Prosthetic Dentistry, Norrköping, Sweden.
authors.forename: Pernilla
authors.initials: P
authors.lastname: Larsson
authors.affiliation: Department of Prosthodontics, School of Dentistry, University of Zagreb, Zagreb, Croatia.
authors.forename: Sanja
authors.initials: S
authors.lastname: Peršić
authors.affiliation: Department of Prosthodontics, University of Pécs, Pécs, Hungary.
authors.forename: Dóra
authors.initials: D
authors.lastname: Kende
authors.affiliation: Department of Prosthetic Dentistry, Center for Dental and Oral Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Reißmann
authors.affiliation: Department of Prosthodontics, Dental Division, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.|Department of Prosthodontics, University Dental Clinics, University Medical Center of Ljubljan, Ljubljan, Slovenia.
authors.forename: Ksenija
authors.initials: K
authors.lastname: Rener-Sitar
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009909:Oral Health; D011476:Prosthodontics; D011594:Psychometrics; D015203:Reproducibility of Results; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires
keywords: Multicenter study; Oral health; Quality of life; Questionnaire; Reliability; Validity