ED visits rise at faster pace; patients increasingly sicker; number over age 44 grows.
D000368:Aged; D002487:Centers for Disease Control and Prevention, U.S.; D003441:Crowding; D004630:Emergencies / Q000145:classification / Q000453:epidemiology; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D019538:Health Care Surveys; D006801:Humans; D008875:Middle Aged; D012720:Severity of Illness Index; D013996:Time and Motion Studies; D014481:United States / Q000453:epidemiology