| Year | Moran’s I | Z-score | P-value | Year | Moran’s I | Z-score | P-value |
|---|---|---|---|---|---|---|---|
| 2013 | 0.1853 | 4.5504 | 0.001*** | 2014 | 0.2306 | 5.7033 | 0.001*** |
| 2015 | 0.2233 | 5.5953 | 0.001*** | 2016 | 0.2229 | 5.5471 | 0.001*** |
| 2017 | 0.1831 | 4.6207 | 0.001*** | 2018 | 0.1822 | 4.5747 | 0.001*** |
Figure 2 The geographic location of cities that implemented administrative division adjustment between 2013 and 2018
Figure 4 The spatiotemporal evolution of urban polycentricity in China in different years: (a) 2013, (b) 2014, (c) 2015, (d) 2016, (e) 2017 and (f) 2018