title: Validity in assessing time processing ability, test equating of KaTid-Child and KaTid-Youth.
abstract: BACKGROUND
  There is a need for instruments with acceptable psychometric properties for measuring time management/time processing ability. KaTid-Child (Swedish: Kit for assessing Time processing ability) was developed for children aged 5-10 years. To meet needs of assessing older children, KaTid-Youth was created. The aim of this study was to investigate the validity of KaTid-Youth.
  
  
  METHODS
  This study investigates the validity of KaTid-Youth using Rasch models: partial credit and common item equating.
  
  
  RESULTS
  Results indicate that KaTid-Youth has acceptable psychometric properties and seems to measure the same construct as KaTid-Child.
  
  
  CONCLUSIONS
  Indications of gender differences in the sample call for further research. The results indicate that time processing ability can be seen as one construct in which time perception, orientation and management can be operationalized as different levels of complexity in time processing ability. Expressions of time processing ability differ at different ages. Thus, early intervention in time perception and time orientation may be needed to promote time management in later childhood. Professionals need to take time processing ability into consideration when meeting children who risk delayed development of daily time management.
authors: Centre for Clinical Research Dalarna, Nissers väg 3, Falun, Sweden. gunnel.janeslatt@ltdalarna.se
authors: G
authors: G
authors: Janeslätt