TABLE 3

IRRs and 95% CIs for Fatal Crashes Involving 16-Year-Old Drivers in Relation to GDL Program Components, Excluding Age Requirements, Compared With Older Drivers in the Same States, United States, 1994–2004

ProgramComponentsNo. State QuartersIRRs (95% CIs)
Learner ≥3 moSupervised ≥30 hNighttime RestrictionPassenger RestrictionAge 16 yAge 20–24 yAge 25–29 y
Aa1860.95 (0.85–1.08)0.94 (0.87–1.02)0.96 (0.87–1.06)
BYes1430.96 (0.83–1.11)0.94 (0.89–1.00)0.91 (0.82–1.01)
CYes1841.01 (0.87–1.16)0.97 (0.91–1.04)0.99 (0.89–1.11)
DYesYes990.96 (0.81–1.14)0.97 (0.89–1.05)0.98 (0.90–1.06)
EbYesYesYes950.79 (0.66–0.94)1.00 (0.91–1.09)0.97 (0.89–1.07)
FbYesYesYes1410.82 (0.71–0.95)0.92 (0.86–1.00)0.94 (0.86–1.02)
GbYesYesYesYes830.84 (0.74–0.96)0.93 (0.85–1.01)0.93 (0.84–1.02)
HcOther combinations of components1.07 (0.85–1.36)0.89 (0.82–0.96)0.94 (0.84–1.05)
ReferencedNoNoNoNo468
  • a Programs having age restrictions but none of these 4 components.

  • b Confidence limits for ages 20 to 24 and 25 to 29 years do not include IRR for age 16 years.

  • c Programs with too few state quarters for analysis.

  • d State quarters with none of the 7 components in Table 1.