Fig. 2shows weighted airbag deployment rates as a function of the
NASS investigator determined EBS. This was based on 322 raw cases
(178,835 weighted cases) with a minimum of 31 raw observations
in each EBS category. Fig. 3shows the weighted distribution of EBS
for all 749 barrier crashes. There were a total of 276 (37%) cases with
no estimate of EBS.
Table 2shows the occupant airbag deployment rate by barrier type
for airbag equipped occupants in the available data. The weighted
values and associated percentages are shown along with the 95%
confidence intervals for the weighted proportions. Based on the RaoScott modified likelihood ratio chi-squared test, a statistically significant difference was found between airbag deployment rates for
different barrier types (p=0.033).