Table 2.

Spearman rank correlations between the significant factors that affected motorized 2–3 wheelers death rate globally over 2007–2016

Variable	2–3 Wheelers per person ratio		Percentage of helmet wearing rate		GNI per capita
	rho	p-value	rho	p-value	rho	p-value
Year 2007
Motorcycle 2-to-3 wheelers death rate	0.408	p < 0.0001	− 0.342	p = 0.019	− 0.048	p = 0.610
GNI	0.494	p < 0.0001	0.390	p = 0.002	–
Year 2010
Motorcycle 2-to-3 wheelers death rate	0.35	p < 0.0001	− 0.389	p = 0.003	− 0.263	p = 0.004
GNI	0.443	p < 0.0001	0.538	p < 0.0001	–
Year 2013
Motorcycle 2-to-3 wheelers death rate	0.382	p < 0.0001	− 0.422	p = 0.001	− 0.366	p < 0.0001
GNI	0.420	p < 0.0001	0.669	p < 0.0001	–
Year 2016
Motorcycle 2-to-3 wheelers death rate	0.324	p = 0.001	− 0.661	p < 0.0001	− 0.312	p < 0.0001
GNI	0.294	p < 0.0001	0.732	p < 0.0001	–

GNI, Gross National Income/capita (US dollars)