Table 1. Descriptive statistics of variables used in the analysis. (N=576 plots)
| Variable | Code | Unit | Mean | S.D. | Max. | Min. |
| DBH | D | cm | 26.6 | 7.3 | 46.5 | 7.7 |
| Height | H | m | 18.1 | 4.8 | 28.2 | 5.5 |
| Dominant tree height | Hd | m | 21.9 | 4.9 | 33.6 | 5.5 |
| Basal area | BA | m2ㆍha−1 | 30.4 | 12.4 | 66.1 | 2.1 |
| Stand volume | V | m3ㆍha−1 | 310.8 | 154.5 | 862.1 | 6.1 |
| Stand age | Age | years | 37.0 | 10.0 | 77.0 | 12.0 |
| Stand density | N | treesㆍha−1 | 613.0 | 325.3 | 2940.0 | 175.0 |
| Site index | SI | m | 20.0 | 2.9 | 26.8 | 8.1 |
| H/D ratio | HD | - | 70.1 | 15.1 | 116.4 | 30.4 |
| Relative yield index | Ry | - | 0.8 | 0.1 | 1.0 | 0.1 |
| Relative spacing index | Rs | % | 22.7 | 8.2 | 97.7 | 11.8 |
| Stand density index | SDI | treesㆍha−1 | 601.2 | 220.6 | 1318.9 | 65.4 |