. Author manuscript; available in PMC: 2012 Aug 1.

Published in final edited form as: J Safety Res. 2011 Jul 31;42(4):283–290. doi: 10.1016/j.jsr.2011.06.001

Table 6.

Effects of Nighttime Restrictions on Alcohol-Involved Fatal Crash Counts for 16- and 17-Year-Old Drivers

(As compared to alcohol-involved crash counts for older drivers and as compared to non-alcohol-involved crash counts for 16- and 17-year-old drivers [Ns range from 824 state-years to 835 state-years]).

Comparison ratio	t-value 11 p.m. or earlier vs. no restriction	t-value midnight vs. no restriction	Overall F nighttime restriction
16–17 vs. 19–20	−1.29	−2.80^**	F (2, 44) = 4.55^*
16–17 vs. 19–25	−2.33^*	−6.16^***	F (2, 44) = 21.20^***
16–17 vs. 19–29	−1.37	−4.64^***	F (2, 44) = 11.43^***
16–17 alcohol vs. 16–17 no alcohol	−2.58^*	−3.20^**	F (2, 44) = 8.09^**

p < .05.

^**

p < .01.

^***

p < .001