High school girls who suffer concussions in sports do not report a greater number of symptoms, take longer for their symptoms to clear, or return to play later than males, says a surprising new study. But while the severity and outcome of concussions, as measured in the time symptoms take to clear and for athletes to return to play, do not vary by gender, the type of symptoms reported by girls are more subtle and easily missed than those boys report, say the new authors of the study published in the Journal of Athletic Training.