highly significantp -value < 1
The age effect in serious injury is highly significant for males victims ( χ 9 2 = 7266 , p -value < 1 0 − 4 ), with serious injury rates ranging from 12% in younger and 31% in older subjects, and for females victims ( χ 9 2 = 3818 , p-value < 1 0 − 4 ), with serious injury rates ranging from 10% in younger and 24% in older subjects.