Respondent demographics for participants (n = 60) with Quantified Tree Risk Assessment (QTRA) training, Certified Arborists® with the International Society of Arboriculture (ISA) Tree Risk Assessment Qualification (TRAQ), and untrained respondents using the ISA Tree Risk Assessment BMP (ISA BMP) system.
| Characteristics | QTRA | TRAQ | ISA BMP |
|---|---|---|---|
| Participants (n) | 21 | 28 | 11 |
| Percent (%) male | 100 | 92.9 | 100 |
| Average age (yrs) | 51.8 | 54.2 | 58.2 |
| Percent (%) parent | 85.0 | 92.9 | 80 |
| Percent (%) homeowner | 90.5 | 85.7 | 100 |
| Percent (%) college graduate | 28.6 | 67.8 | 63.6 |
| Percent (%) advanced degree | 42.9 | 17.9 | 27.3 |
| Percent (%) ISA Certified Arborist | 0 | 82.1 | 27.3 |
| Percent (%) ISA BCMA™ | 4.7 | 17.9 | 0 |
| Percent (%) perform risk assessmentsZ | 100 | 85.7 | 54.5 |
| Median risk assessments annually | 500 | 25 | 100 |
↵Z The percent of respondents who perform risk assessments as part of their work.