Table 3.
Descriptive characteristics of environmental variables
| Environmental variables | Mean | SD | Minimum | Maximum |
|---|---|---|---|---|
| Length of freeway/ highway (km) | 40.9 | 57.3 | 0.0 | 380.0 |
| Length on one - way main roads (km) | 24.9 | 46.9 | 0.0 | 300.0 |
| Length of two - way main roads (km) | 104.1 | 103.5 | 0.0 | 609.0 |
| Length of by way roads (km) | 382.3 | 466.7 | 0.0 | 2688.0 |
| Literacy rate (percentage) | 0.8 | 0.06 | 0.6 | 0.9 |
| Number of household owning motorcycle | 14,344.82 | 13,342.9 | 341.0 | 100,837.0 |
| Percentage of household owning car | 37.3 | 9.1 | 10,8 | 61.1 |
| Population of young people (person) | 38,936.4 | 43,524.6 | 1217.2 | 371,702.3 |
| Mean of traffic count (per minute) | 6.4 | 7.8 | 0.6 | 74.9 |
| Proportion length of main roads to the total roads (percentage) | 19.8 | 22,3 | 0.0 | 100.0 |