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Table 1 Linear mixed effect model of factors affecting log transformation of motorized 2–3 wheelers death rate globally over 2007–2016

From: Motorized 2–3 wheelers death rates over a decade: a global study

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

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