The most important reasons for not preserving trees, by survey and group (mean scores represent the percentage of projects in which respondents selected a single reason why trees were not preserved).
| Reasons why trees were not preserved | Survey | Group | Total n = 553 | |||||
|---|---|---|---|---|---|---|---|---|
| PA n = 212 | NADF n = 340 | F value | Arborist n = 230 | Builder n = 71 | Designer n = 190 | F value | ||
| Site constraints | 3.27 | 3.42 | 1.45 | 3.00 a | 4.00 b | 3.64 b | 20.02 | 3.34 |
| Insufficient knowledge | 2.36 | 2.38 | 0.02 | 2.90 a | 1.66 b | 1.90 b | 33.56 | 2.43 |
| Costs too much | 2.50* | 2.25* | 4.55 | 2.60 a | 2.20 ab | 2.09 b | 8.27 | 2.37 |
| Too much time | 2.14 | 1.94 | 3.39 | 2.30 a | 1.66 b | 1.76 b | 13.55 | 2.03 |
| Building codes | 1.67* | 1.92* | 6.98 | 1.87 a | 1.72 a | 1.81 a | 0.51 | 1.85 |
| Deadlines | 1.85 | 1.82 | 0.07 | 1.95 a | 1.51 b | 1.74 ab | 4.99 | 1.85 |
Between surveys, an asterisk indicates means are significantly different at p < .05; d.f. = 1, 550.
Among groups, means within a row followed by the same letter are not significantly different at p < .05; d.f, 2, 488.
A score of 5 indicated that the item was the most important reason for not preserving trees in 76% to 100% of projects, 4 indicated most important in 51% to 75% of projects, 3 indicated most important in 26% to 50% of projects, 2 indicated most important in 1% to 25% of projects, and 1 indicated not important in any projects.