title: Validation of the malaysian versions of parents and children health survey for asthma by using rasch-model.
abstract: BACKGROUND
  In recent years, health-related quality of life (HRQOL) has become an important outcome measure in epidemiologic studies and clinical trials. For patients with asthma there are many instruments but most of them have been developed in English. With the increase in research project, researchers working in other languages have two options; either to develop a new measure or to translate an already developed measure. Children Health Survey for Asthma is developed by American Academy of Paediatrics which has two versions one for the parents (CHSA) and the other for the child (CHSA-C). However, there is no Malay version of the CHSA or the CHSA-C.
  
  
  OBJECTIVE
  The aim of this study was to translate and determine the validity and reliability of the Malaysian versions of Parent and Children Health Survey for Asthma.
  
  
  METHODS
  Questionnaires were translated to Bahasa Malayu using previously established guidelines, data from 180 respondents (asthmatic children and their parent) were analysed using Rasch-Model; as, it is an approach that has been increasingly used in health field and also it explores the performance of each item rather than total set score.
  
  
  RESULTS
  The internal consistency was high for the parent questionnaire (CHSA) (reliability score for persons = 0.88 and for items was 0.97), and good for child questionnaire (CHSA-C) (reliability score for persons = 0.83 and for items was 0.94). Also, this study shows that all items measure for both questionnaires (CHSA and CHSA-C) are fitted to Rasch-Model.
  
  
  CONCLUSIONS
  This study produced questionnaires that are conceptually equivalent to the original, easy to understand for the children and their parents, and good in terms of internal consistency. Because of the questionnaire has two versions one for the child and the other for the parents, they could be used in clinical practice to measure the effect of asthma on the child and their families. This current research had translated two instruments to other language (BahasaMalayu) and evaluated their reliability and validity hence will help researchers from the same country to use these translated instruments in their studies.
authors.affiliation: Master in Clinical Pharmacy, Clinical Pharmaceutics Research Group (CPRG), Faculty of Pharmacy, Universiti Teknologi MARA , Puncak Alam Campus, 42300, Bandar Puncak Alam, Selangor, Malaysia .
authors.forename: Maryam Se
authors.initials: MS
authors.lastname: Hussein
authors.affiliation: Master in Clinical Pharmacy, Clinical Pharmaceutics Research Group (CPRG), Faculty of Pharmacy, Universiti Teknologi MARA , Puncak Alam Campus, 42300, Bandar Puncak Alam, Selangor, Malaysia .
authors.forename: Waqas
authors.initials: W
authors.lastname: Akram
authors.affiliation: Associate Professor (Ethics Education), i-Learn Centre, Academic Affairs Division Universiti Teknologi Mara Malaysia Shah Alam , Malaysia .
authors.forename: Mohd Nor
authors.initials: MN
authors.lastname: Mamat
authors.affiliation: Professor, Department of Pharmaceutical Science, Clinical Pharmaceutics Research Group (CPRG), Faculty of Pharmacy, Universiti Teknologi MARA , Puncak Alam Campus, 42300, Bandar Puncak Alam, Selangor, Malaysia .
authors.forename: Abu Bakar Abdul
authors.initials: AB
authors.lastname: Majeed
authors.affiliation: PhD (Clinical Pharmaceutics and Pharmaceutical Innovation), Clinical Pharmaceutics Research Group (CPRG), Faculty of Pharmacy, Universiti Teknologi MARA , Puncak Alam Campus, 42300, Bandar Puncak Alam, Selangor, Malaysia .
authors.forename: Nahlah Elkudssiah Binti
authors.initials: NE
authors.lastname: Ismail
keywords: CHSA; CHSA-C; Rasch analysis; Reliability; Validity