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Table 5 Descriptive statistics of the database for accident analysis: accident frequencies
Accident type | Indicator | Drivers' group, period | Mean | s.d | min | max |
|---|---|---|---|---|---|---|
Total injury accidents | Accidents' number per driver | Treatment, before | 0.086 | 0.298 | 0 | 4 |
Treatment, after | 0.044 | 0.215 | 0 | 4 | ||
Comparison, before | 0.030 | 0.175 | 0 | 4 | ||
Comparison, after | 0.023 | 0.156 | 0 | 4 | ||
Accident rate per 1,000 days (a2time) | Treatment, before | 0.079 | 0.272 | 0 | 3.65 | |
Treatment, after | 0.040 | 0.197 | 0 | 3.65 | ||
Comparison, before | 0.027 | 0.160 | 0 | 3.65 | ||
Comparison, after | 0.021 | 0.143 | 0 | 3.65 | ||
Severe accidents | Accidents' number per driver | Treatment, before | 0.009 | 0.093 | 0 | 2 |
Treatment, after | 0.005 | 0.071 | 0 | 2 | ||
Comparison, before | 0.003 | 0.057 | 0 | 2 | ||
Comparison, after | 0.002 | 0.048 | 0 | 2 | ||
Accident rate per 1,000 days (a2time) | Treatment, before | 0.008 | 0.085 | 0 | 1.83 | |
Treatment, after | 0.005 | 0.065 | 0 | 1.83 | ||
Comparison, before | 0.003 | 0.052 | 0 | 1.83 | ||
Comparison, after | 0.002 | 0.044 | 0 | 1.83 |