Which of the Following Statements About the Impact of Motorcycle

Multiple Choice

Which of the following statements about the impact of motorcycle helmet usage is TRUE?

A) Helmet use moderately increases the incidence of cervical spine injury.
B) Helmet use moderately decreases the incidence of cervical spine injury.
C) Helmet use substantially decreases the incidence of cervical spine injury.
D) Helmet use neither increases nor decreases the incidence of cervical spine injury.