Summary data for four genera of trees detailing mean tree lawn size, mean time from planting, and number joints observed.
| Genus | Mean tree lawn size meters (ft) | Mean time since planting (years) | Number of joints observed |
|---|---|---|---|
| Gleditsia | 1.6 (5.3) | 11.0 | 282 |
| Koelreuteria | 1.4 (4.6) | 10.6 | 234 |
| Quercus | 2.3 (7.4) | 9.8 | 384 |
| Zelkova | 2.1 (6.8) | 9.0 | 225 |
| All | |||
| Total | — | — | 1125 |
| Mean | 2.0 (6.5) | 10.1 | 281 |
| Median | 1.9 (6.2) | 9.0 | — |
| Std. dev. | 0.5 (1.8) | 3.7 | — |