Table 2.

Difference-in-Differences Model Parameter Estimates.

MODEL	PARAMETER	COEFFICIENT $\beta$	ODDS RATIO
			$\text{exp}\left(\beta \right)$	LOWER 95 % CI	UPPER 95 % CI
(a) DRIVERS (Aged 80+)	${\mathit{\beta }}_0$	−3.84	0.021	0.015	0.030*
	${\mathit{\beta }}_{2018}$	0.075	1.078	0.684	1.712
	${\mathit{\beta }}_{2019}$	0.210	1.234	0.796	1.935
	${\mathit{\beta }}_{2020}$	0 (reference)	1.000	–	–
	${\mathit{\beta }}_{\mathit{p}\mathit{o}\mathit{s}\mathit{t}}$	−1.040	0.353	0.105	0.892*
	${\mathit{\beta }}_{\mathit{p}\mathit{r}\mathit{e}}$	0 (reference)	1.000	–	–
	${\mathit{\beta }}_{2018\times \mathit{p}\mathit{o}\mathit{s}\mathit{t}}$	1.332	3.789	1.375	13.459*
	${\mathit{\beta }}_{2019\times \mathit{p}\mathit{o}\mathit{s}\mathit{t}}$	1.176	3.241	1.179	11.489*
(b) PEDESTRIANS (Aged 80+)	${\mathit{\beta }}_0$	−3.59	0.028	0.011	0.057
	${\mathit{\beta }}_{2018}$	0.208	1.231	0.422	3.793
	${\mathit{\beta }}_{2019}$	0.319	1.376	0.449	4.342
	${\mathit{\beta }}_{2020}$	0 (reference)	1.000	–	–
	${\mathit{\beta }}_{\mathit{p}\mathit{o}\mathit{s}\mathit{t}}$	−0.382	0.682	0.036	4.113
	${\mathit{\beta }}_{\mathit{p}\mathit{r}\mathit{e}}$	0 (reference)	1.000	–	–
	${\mathit{\beta }}_{2018\times \mathit{p}\mathit{o}\mathit{s}\mathit{t}}$	0.399	1.490	0.189	31.909
	${\mathit{\beta }}_{2019\times \mathit{p}\mathit{o}\mathit{s}\mathit{t}}$	0.655	1.926	0.246	41.288
(c) DRIVERS (Aged 35−54)	${\mathit{\beta }}_0$	−0.592	0.553	0.499	0.612*
	${\mathit{\beta }}_{2018}$	−0.052	0.949	0.825	1.091
	${\mathit{\beta }}_{2019}$	−0.009	0.991	0.863	1.138
	${\mathit{\beta }}_{2020}$	0 (reference)	1.000	–	–
	${\mathit{\beta }}_{\mathit{p}\mathit{o}\mathit{s}\mathit{t}}$	−0.261	0.771	0.622	0.951*
	${\mathit{\beta }}_{\mathit{p}\mathit{r}\mathit{e}}$	0 (reference)	1.000	–	–
	${\mathit{\beta }}_{2018\times \mathit{p}\mathit{o}\mathit{s}\mathit{t}}$	0.284	1.329	1.037	1.707*
	${\mathit{\beta }}_{2019\times \mathit{p}\mathit{o}\mathit{s}\mathit{t}}$	0.316	1.372	1.070	1.764*

CI: Confidence Interval;

^*Significant change in the proportion of injuries and fatalities attributable by age group, using the 95 % profile likelihood confidence interval (p < 0.05).