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

Variable Coefficient Odds ratio Standard error value Intercept −8.1149*** 0.0983 <0.0001 Policy interaction −0.2693** 0.764 0.1057 0.0108  Policy*Center 0.3664** 1.443 0.1643 0.0258  Policy*South 0.3881*** 1.474 0.1334 0.0036  Policy*East 0.5242 1.689 0.4110 0.2021 Geographic locations  Center 0.3881*** 1.474 0.1334 0.0036  South 0.5242 1.689 0.4110 0.2021  East 0.0561 1.058 0.3108 0.8568  (ref.: north) Gender 0.3301*** 1.391 0.0572 <0.0001 Age  Children −2.0731*** 0.126 0.1647 <0.0001  Adult 15–24 0.6227*** 1.864 0.0606 <0.0001  Elderly −0.0431 0.958 0.1192 0.7178  (ref.: adult 25–64) Rural/urban  City −0.2614** 0.770 0.1260 0.0380  County administered 0.3246*** 1.383 0.0947 0.0006  Town 0.9101*** 2.485 0.0927 <0.0001  Village 0.4130*** 1.511 0.0891 <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.