Table 5: Logistic regression for the likelihood of sustaining a head injury in a motorcycle accident.

VariableCoefficientOdds ratioStandard error value

Intercept−8.1149***0.0983<0.0001

Policy interaction−0.2693**0.7640.10570.0108
 Policy*Center0.3664**1.4430.16430.0258
 Policy*South0.3881***1.4740.13340.0036
 Policy*East0.52421.6890.41100.2021

Geographic locations
 Center0.3881***1.4740.13340.0036
 South0.52421.6890.41100.2021
 East0.05611.0580.31080.8568
 (ref.: north)

Gender 0.3301***1.3910.0572<0.0001

Age
 Children−2.0731***0.1260.1647<0.0001
 Adult 15–24 0.6227***1.8640.0606<0.0001
 Elderly−0.04310.9580.11920.7178
 (ref.: adult 25–64)

Rural/urban
 City−0.2614**0.7700.12600.0380
 County administered 0.3246***1.3830.09470.0006
 Town 0.9101***2.4850.0927<0.0001
 Village 0.4130***1.5110.0891<0.0001
 (ref.: special municipality)

a***Denotes significant at 0.01 level; **denotes significant at 0.05 level; *denotes significant at 0.1 level.
bReference groups: north, female, adult 25–64, special municipality, Policy*North.
Observations = 1809237.