@article{ref1,
title="The minimal clinically important difference for the Rasch neuropsychiatric inventory irritability and aggression scale for traumatic brain injury",
journal="Archives of physical medicine and rehabilitation",
year="2018",
author="Malec, James F. and Hammond, Flora M.",
volume="99",
number="3",
pages="603-606.e1",
abstract="OBJECTIVE: To determine the Minimal Clinically Important Difference (MCID) for a Rasch measure derived from the Irritability/Lability and Agitation/Aggression subscales of the Neuropsychiatric Inventory (NPI-TBI-IA). <br><br>DESIGN: Distribution-based statistical methods were applied to retrospective data to determine candidates for the MCID. These candidates were evaluated by anchoring the NPI-TBI-IA to Global Impression of Change (GIC) ratings by participants, significant others, and a supervising physician. MAIN OUTCOME MEASURE: NPI-TBI-IA. SETTING: Postacute rehabilitation outpatient clinic. PARTICIPANTS: 274 cases with observer ratings; 232 cases with self-ratings by participants with moderate-severe TBI at least 6 months post-injury. <br><br>RESULTS: For observer ratings on the NPI-TBI-IA, anchored comparisons found an improvement of ½ SD was associated with at least minimal general improvement on GIC by a significant majority (69-80%); ½ SD improvement on participant NPI-TBI-IA self-ratings was also associated with at least minimal improvement on the GIC by a substantial majority (77-83%). The percent indicating significant global improvement did not increase markedly on most ratings at higher levels of improvement on the NPI-TBI-IA. <br><br>CONCLUSIONS: A ½ SD improvement on the NPI-TBI-IA indicates the MCID for both observer and participant ratings on this measure.<br><br>Copyright © 2017. Published by Elsevier Inc.<p /> <p>Language: en</p>",
language="en",
issn="0003-9993",
doi="10.1016/j.apmr.2017.06.038",
url="http://dx.doi.org/10.1016/j.apmr.2017.06.038"
}