@article{ref1,
title="Sport-related concussion: factors associated with prolonged return to play",
journal="Clinical journal of sport medicine",
year="2004",
author="Asplund, Chad A. and McKeag, Douglas B. and Olsen, Cara H.",
volume="14",
number="6",
pages="339-343",
abstract="OBJECTIVE: To assess predictive value of concussion signs and symptoms based on return-to-play timelines. <br><br>DESIGN: Physician practice study without diagnosis that includes presentation, initial and subsequent treatment, and management of concussion. SETTING: National multisite primary care sports medicine provider locations. PARTICIPANTS: Twenty-two providers at 18 sites; 101 athletes (91 men, 10 women in the following sports: 73 football, 8 basketball, 8 soccer, 3 wrestling, 2 lacrosse, 2 skiing, 5 others; 51 college, 44 high school, 4 professional, and 2 recreational). MAIN OUTCOME MEASUREMENTS: Duration of symptoms, presence of clinical signs, and time to return to play following concussion. <br><br>RESULTS: One hundred one concussions were analyzed. Pearson chi2 analysis of common early and late concussion symptoms revealed statistical significance (P < 0.05) of headache >3 hours, difficulty concentrating >3 hours, any retrograde amnesia or loss of consciousness, and return to play >7 days. There appeared to be a trend in patients with posttraumatic amnesia toward poor outcome, but this was not statistically significant. <br><br>CONCLUSIONS: When evaluating concussion, symptoms of headache >3 hours, difficulty concentrating >3 hours, retrograde amnesia, or loss of consciousness may indicate a more severe injury or prolonged recovery; great caution should be exercised before returning these athletes to play.<p /><p>Language: en</p>",
language="en",
issn="1050-642X",
doi="",
url="http://dx.doi.org/"
}