the odds ratio represents a comparison to a completely unrestrained
occupant (i.e., no belt used and no airbag available). For the barrier
type, the odds ratio represents a comparison to rigid barriers (i.e.,
concrete barriers and bridge rails combined). The 95% confidence
bounds on each ratio are also shown.
With the exception of the airbag only restrained occupants at
the MAIS 2+ level, all restraint conditions show a decrease in the
odds of injury compared to the unrestrained condition. The decrease
was statistically significant for the fully restrained occupant at the
MAIS 3+ injury level. For the belt only restrained occupant, the
decrease was statistically significant at the MAIS 3+ injury level. In
terms of barrier type, the odds of occupant injury were decreased
when impacting a non-rigid barrier. These decreases, however, were
statistically significant only at the MAIS 2+ level but nearly statistically significant at the MAIS 3+ level (upper 95% confidence
bound=1.08).
Fig. 4shows the odds ratio results for the four occupant restraint
conditions based on the EBS adjusted model. All odds ratios are with
respect to the unrestrained condition and the error bars represent
the 95% confidence bounds on the point estimates. Statistically significant differences from the completely unrestrained condition are
noted by an asterisk (*).