@article{ref1,
title="A Rasch analysis of the QOLIBRI Six-Item Overall Scale",
journal="Assessment",
year="2015",
author="Muehlan, Holger and Wilson, Lindsay and Steinbüchel, Nicole von",
volume="23",
number="1",
pages="124-130",
abstract="OBJECTIVE: The Quality Of Life after BRain Injury (QOLIBRI) consortium has developed a short six-item scale (QOLIBRI-OS) to screen health-related quality of life after traumatic brain injury. The goal of the current study is to examine further psychometric qualities of the Quality Of Life after BRain Injury-Overall Scale (QOLIBRI-OS) at the item level using Rasch analysis with particular emphasis on the operating characteristics of the items. <br><br>METHOD: A total of 921 participants with traumatic brain injury were recruited. The analysis sample was restricted to 795 participants with Glasgow Coma Score and Glasgow Outcome Score-Extended available in order to ensure a well-characterized sample. <br><br>RESULTS: Overall fit statistics indicate sufficient reliability of the QOLIBRI-OS. The assumption of unidimensionality could be confirmed with reservation. The range of item locations is small, whereas item thresholds cover a wide range of the latent trait. The majority of parameter estimations for all class intervals of the respective test are in accordance with the model assumptions. <br><br>CONCLUSION: The results show that, despite marginal misfits to the model, the six items representing the QOLIBRI-OS could establish a Rasch scale.<p /><p>Language: en</p>",
language="en",
issn="1073-1911",
doi="10.1177/1073191115569844",
url="http://dx.doi.org/10.1177/1073191115569844"
}