Table 7: Poisson regression for length of stay per head injury in a motorcycle accident.

VariableCoefficientaStandard error value

Intercept 2.0449***0.0265<0.0001

Policy interactions −0.01140.04070.7797
 Policy*Center−0.2175***0.07080.0021
 Policy*South−0.2780***0.0567<0.0001
 Policy*East0.3236*0.18400.0785

Geographic locations
 Center0.03830.05550.4897
 South−0.01610.04240.7036
 East−0.23330.15380.1293
 (ref.: north)

Gender0.01230.02380.6056

Age
 Children −0.2245***0.07090.0015
 Adult 15–24 −0.2330***0.0253<0.0001
 Elderly−0.00420.04710.9292
 (ref.: adult 25–64)

Rural/urban
 City −0.1608***0.05670.0045
 County administered −0.2153***0.0411<0.0001
 Town−0.05250.03880.1756
 Village−0.01410.03750.7079
 (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 = 1,254.