@article{ref1,
title="Factor structure of the Rivermead Post-Concussion Symptoms Questionnaire over the first year following mild traumatic brain injury",
journal="Brain injury",
year="2018",
author="Barker-Collo, Suzanne and Theadom, Alice M. and Starkey, Nicola and Kahan, Michael and Jones, Kelly and Feigin, Valery",
volume="32",
number="4",
pages="453-458",
abstract="BACKGROUND: We examined the factor structure of the Rivermead Post-Concussion Symptom Questionnaire (RPQ), the most commonly used measure of post-concussive symptoms, over the first year post-injury. <br><br>METHOD: Factor analysis (orthogonal rotation) was used to examine the RPQ items that form coherent subsets/factors within 2-weeks, and 1, 6, and 12-months post-mTBI in 527 adults (age >16 years). <br><br>RESULTS: At baseline, three factors accounted for 63.95% of the variance; factor 1 reflected cognitive and physiological disturbances; factor 2 included items reflecting mood, sleep, and nausea/vomiting; and factor 3 included visual/auditory disturbances, dizziness, and headaches. At 1 month, three factors were again extracted (63.26% variance). Factor 1 reflected cognitive and mood symptoms, factor 2 reflected mood with headache, nausea, and dizziness; and factor 3 reflected visual disturbances. Two factors were obtained at 6 and 12 months (63.7% and 63.38% of variance): factor 1 included mood/cognitive items, restlessness, sleep disturbance, and noise sensitivity; whereas, factor 2 included physiological symptoms. <br><br>CONCLUSIONS: The factor structure of the RPQ changes over time; however, it was relatively stable from 6 to 12-months post-injury. Subject to further evaluation, assessments conducted from 6 months could consider using these two factors as subscales. Changing the factor structure of RPQ before 6 months suggests that timing of assessment should be considered in applying these factors.<p /> <p>Language: en</p>",
language="en",
issn="0269-9052",
doi="10.1080/02699052.2018.1429659",
url="http://dx.doi.org/10.1080/02699052.2018.1429659"
}