Table 2.

Comparisons of weekday crash rates between City of Virginia Beach and Chesapeake for teenaged (“teen”) driver group 16-18 years old and all other age groups (excludes 16-18 year olds) combined for Year 2007

	Virginia Beach	Chesapeake	Difference between crash rates in 2 cities	95% confidence interval of difference between 2 cities		p-value
Crash rate for teens 16-18 y (per 1000)	71.2	55.6	15.6	9.0	22.3	< 0.001
Crash rate for all other ages (excluding teenagers 16-18 y) combined (per 1000)	23.9	20.4	3.5	2.6	4.5	< 0.001
Crash rate difference between teens 16-18 y and all other ages combined	47.3	35.2	12.1	9.2	15.0	< 0.001
Crash rate for all ages (per 1000)	26.0	22.4	3.6	2.7	4.6	< 0.001