Table 1.

Linear mixed effect model of factors affecting log transformation of motorized 2–3 wheelers death rate globally over 2007–2016

Variable	Estimate	SE	t-value	p-value	LL 95% CI	UL 95% CI
Year 2007	0.017	0.130	0.133	0.896	− 0.266	0.301
Year 2010	0.059	0.100	0.591	0.558	− 0.144	0.262
Year 2013	− 0.003	0.083	− 0.041	0.968	− 0.170	0.163
Density of population	5.779⁻⁵	5.536⁻⁵	1.044	0.302	− 5.370⁻⁵	0.169⁻³
GNI	− 1.220⁻⁵	5.239⁻⁶	− 2.329	0.025	− 2.280⁻⁵	− 1.602⁻⁶
Vehicle per person ratio	0.545	0.489	1.114	0.268	− 0.427	1.517
Motorized 2–3 wheelers/person ratio	7.851	1.725	4.552	0.000	4.433	11.270
Enforcement of speed	− 0.039	0.023	− 1.666	0.103	− 0.087	0.008
Enforcement of helmet	0.011	0.021	0.531	0.599	− 0.031	0.053
Percentage of helmet wearing rate	− 0.004	0.002	− 2.047	0.046	− 0.008	− 7.898⁻⁵
Vehicle/person ratio * motorized 2–3 wheelers/person ratio	− 4.792	1.953	− 2.454	0.016	− 8.667	− 0.916
Intercept	0.637	0.249	2.558	0.012	0.143	1.131

SE, standard error; LL, lower limit; CI, confidence interval; UL, upper limit