Article Figures & Data
Figures
- Figure 1.
Comparison of ratings submitted by ISA Certified Arborist® (CA) participants with the International Society of Arboriculture Tree Risk Assessment Qualification (TRAQ) and an ISA BMP group. Each respondent assessed 3 trees (n = 82 assessments for TRAQ and n = 32 assessments for ISA BMP).
- Figure 2.
Differences in mitigation strategies recommended by respondents with Quantified Tree Risk Assessment training (QTRA; n = 21), respondents with International Society of Arboriculture Tree Risk Assessment Qualification training (TRAQ; n = 28), and respondents lacking either training (ISA BMP, n = 11). Each participant assessed 3 trees and was permitted to recommend more than 1 strategy per tree. As such, percentages represent a total of 74, 119, and 38 mitigation recommendations for QTRA, TRAQ, and ISA BMP, respectively.
- Figure 3.
Box and whisker plots depicting the variability of likelihood of failure ratings made using 1-year and 3-year timeframes. A likelihood of failure rating of 1 = improbable, 2 = possible, 3 = probable, and 4 = imminent. The bolded numbers represent median values. The green boxes represent the interquartile range of the ratings. The whiskers represent the minimum and maximum recorded values. Based on 117 assessments from 39 participants.
Tables
- 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.
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.
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