Tree condition and the percentage of the area under tree canopy which consists of impervious surfaces.
| Conditio. | Mean percen.* | Standard deviatio. | Numbe. |
|---|---|---|---|
| Vigorous, good | 28.7 | 28.7 | 475 |
| Vigorous, poor | 32.0 | 29.1 | 25 |
| Stable, good | 41.3 | 26.0 | 747 |
| Stable, poor | 39.1 | 27.6 | 88 |
| F ratio = 21.27, Significance P = .001 | |||
↵* Percent area under tree canopy which consists of impervious surfaces
Note: Data not collected for trees categorized as dead or declining.