title: Refinement of the SWN-20 based on the Rasch rating model.
abstract: OBJECTIVE
  The aim of the present study was to refine the 20-item Subjective Well-Being under Neuroleptic Treatment Scale (SWN-20) using the Rasch rating model to validate measurements of subjective well-being in patients with schizophrenia undergoing antipsychotic treatment.
  
  
  METHODS
  In total, 854 (403 males, 451 females) inpatients (n=213) and outpatients (n=641) with schizophrenia participated in this study, which was designed as an open-label investigation of paliperidone extended release. The participants completed the Korean version of the SWN-20 themselves. Refinement of the Korean version of the SWN-20 was accomplished using the Rasch rating model.
  
  
  RESULTS
  Infit and outfit statistics for all 20 items satisfied the criterion for construct validity. Second, all items except items 2 and 20 had suitable point-measure correlations, reflecting content validity. Third, item characteristic curves indicated that roughly 18 items were evenly distributed along the person ability continuum. Finally, option analysis of the category characteristics showed that categories 3 and 4 in the SWN-20 response format were unnecessary.
  
  
  CONCLUSIONS
  We offer several recommendations for improving the SWN-20: (a) items 2 and 20 should be omitted to ensure construct validity; (b) easier items would be added related to the person ability estimates in the process of validating a short form of the SWN scale based on item response theory; and (c) the number of response categories should be reduced for schizophrenic patients.
authors.affiliation: Department of Psychology, Yonsei University, Seoul, Republic of Korea.
authors.forename: In-Jo
authors.initials: IJ
authors.lastname: Park
authors.affiliation: Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Republic of Korea.
authors.forename: Dong Chung
authors.initials: DC
authors.lastname: Jung
authors.affiliation: Department of Psychology, Chonnam National University, Gwangju, Republic of Korea.
authors.forename: Samuel Suk-Hyun
authors.initials: SS
authors.lastname: Hwang
authors.affiliation: Institute of Human Behavioral Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Psychiatry, SMG-SNU Boramae Medical Center, Seoul, South Korea.
authors.forename: Hee Yeon
authors.initials: HY
authors.lastname: Jung
authors.affiliation: Department of Psychiatry, Chonnam National University Medical School, Gwangju, Republic of Korea.
authors.forename: Jin-Sang
authors.initials: JS
authors.lastname: Yoon
authors.affiliation: Department of Psychiatry, Inha University Hospital, Incheon, Republic of Korea.
authors.forename: Chul-Eung
authors.initials: CE
authors.lastname: Kim
authors.affiliation: Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Republic of Korea; Institute of Human Behavioral Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea. Electronic address: aym@snu.ac.kr.
authors.forename: Yong Min
authors.initials: YM
authors.lastname: Ahn
authors.affiliation: Department of Psychiatry, Dongguk University Ilsan Hospital, Goyang, Republic of Korea; Institute of Clinical Psychopharmacology, Dongguk University Ilsan Hospital, Goyang, Republic of Korea. Electronic address: kys@snu.ac.kr.
authors.forename: Yong Sik
authors.initials: YS
authors.lastname: Kim
mesh_terms: D014150:Antipsychotic Agents / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015233:Models, Statistical; D000068882:Paliperidone Palmitate / Q000627:therapeutic use*; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D056910:Republic of Korea; D012107:Research Design; D012559:Schizophrenia / Q000188:drug therapy*; D057566:Self Report; D011795:Surveys and Questionnaires / Q000592:standards*; D014177:Translations; D016896:Treatment Outcome
chemical_list: D014150:Antipsychotic Agents; D000068882:Paliperidone Palmitate