Table 2 Descriptive statistics of accessibility based on school visits per walk in the whole network
School visits per walk statistics/year | 1991 | 1999 | 2007 | 2016 |
Non-school visiting node percentage | 12.7% | 16.5% | 18.6% | 24.3% |
Mean | 0.45 | 0.32 | 0.29 | 0.24 |
Standard deviation | 0.55 | 0.46 | 0.43 | 0.42 |
Median | 0.23 | 0.13 | 0.1 | 0.06 |