Table 1.

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.

CharacteristicsQTRATRAQISA BMP
Participants (n)212811
Percent (%) male10092.9100
Average age (yrs)51.854.258.2
Percent (%) parent85.092.980
Percent (%) homeowner90.585.7100
Percent (%) college graduate28.667.863.6
Percent (%) advanced degree42.917.927.3
Percent (%) ISA Certified Arborist082.127.3
Percent (%) ISA BCMA4.717.90
Percent (%) perform risk assessmentsZ10085.754.5
Median risk assessments annually50025100
  • Z The percent of respondents who perform risk assessments as part of their work.