Table 5

Poisson regression analysis of RTC fatality rates by age and gender

ModelIRR95% CIP valueAdjusted IRR95% CIP value
Age group 1–14 years
MalesYear0.920.90 to 0.93<0.0010.950.91 to 1.000.05
Interv year 19931.330.98 to 1.810.11.070.74 to 1.540.7
Interv year 20020.610.42 to 0.89<0.050.610.43 to 0.88<0.01
Interv year 20060.790.50 to 1.260.31.070.65 to 1.760.7
Interv year 20100.680.48 to 0.98<0.050.660.40 to 1.090.1
FemalesYear0.930.91 to 0.94<0.0011.010.97 to 1.050.5
Interv year 19931.320.93 to 1.880.10.800.56 to 1.150.2
Interv year 20020.370.24 to 0.57<0.0010.290.18 to 0.47<0.001
Interv year 20060.800.41 to 1.550.51.260.63 to 2.520.5
Interv year 20100.630.36 to 1.110.10.480.25 to 0.91<0.05
Age group 15–19 years
MalesYear0.950.94 to 0.97<0.0011.010.96 to 1.060.7
Interv year 19931.300.92 to 1.850.10.860.60 to 1.230.4
Interv year 20020.830.51 to 1.350.40.750.49 to 1.140.2
Interv year 20060.570.36 to 0.91<0.050.710.45 to 1.110.1
Interv year 20100.430.31 to 0.61<0.0010.430.27 to 0.68<0.001
FemalesYear0.960.94 to 0.98<0.0010.990.94 to 1.061.0
Interv year 19931.340.82 to 2.190.20.980.60 to 1.621.0
Interv year 20020.850.48 to 1.470.50.870.58 to 1.320.5
Interv year 20060.530.33 to 0.85<0.010.580.40 to 0.86<0.01
Interv year 20100.650.34 to 1.250.20.770.38 to 1.570.5
  • Unadjusted IRRs relate to univariate analysis of variable for one intervention point and thus equates to the cumulative effect of several interventions after that point. Adjusted IRRs provide estimates for risk relating to effect of one specific intervention point while adjusting for potential confounding effect of other interventions in a multivariable analysis. Total RTC fatalities include additional deaths involving cyclists and other collisions involving motor vehicles for, example, animal riders.

  • Interv year, year of intervention; IRR, incidence rate ratio; RTC, road transport collision.