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Table 3 Modeling the psychophysical components of the TMT-B (n = 45)

From: The trail making test as a screening instrument for driving performance in older drivers; a translational research

  TMT-B
  IRR[CI95%] R2
Socio-demographic   
Age (years) 1.05 [0.91 to 1.20] 0.006
Gender (male) 1.14 [0.89 to 1.45] 0.016
Education (years of schooling) 0.91 [0.79 to 1.04] 0.150
Literacy (KHE [sec]) 1.23 [1.09 to 1.39]* 0.146
Optical tests   
Visual acuity (FrACT arc minutes) 0.97 [0.88 to 1.06] 0.004
Contrast sensitivity (75% threshold Gabor patch) 1.12 [1.02 to 1.22]* 0.075
Neuropsychological tasks   
Visio-spatial search (TMT-A [sec]) 1.25 [1.10 to 1.41]* 0.157
Mental flexibility (Perseverative errors WCST [%]) 1.11 [0.96 to 1.29] 0.035
Working memory (Digit backwards [n°]) 0.75 [0.62 to 0.91]* 0.109
Verbal fluency ([animals + fruit–veg.] /2 [n°/min]) 0.85 [0.73 to 0.98]* 0.074
Functional mobility (timed up-and-go test - TUG [sec]) 1.11 [0.99 to 1.11] 0.047
Computed tasks   
Visual processing (Vernier’s Task)   
Vernier offset (ms) 1.12 [0.93 to 1.34] 0.023
Vernier duration (ms) 1.12 [0.90 to 1.40] 0.015
Masking effect without shine through SOA 5 (ms) 1.11 [0.97 to 1.27] 0.035
Simple response time (ms) 1.11 [0.93 to 1.32] 0.029
Visual search (RT [ms]) 1.12 [0.96 to 1.32] 0.040
Motion direction sensitivity (% dots) 1.17 [1.06 to 1.29]* 0.125
Orientation discrimination sensitivity 1.17 [1.09 to 1.25]* 0.091
Biological motion 0.95 [0.80 to 1.13] 0.005
Simon’s effect (Δt [ms]) 1.03 [0.86 to 1.25] 0.002
  1. *Significant at p < 0.05. † Incidence risk ratio was measured using Poisson regression. Continuous values were transformed to be normally distributed and have a range of 0 to 1 from the twenty-fifth to the seventy-fifth percentile of the population. FrACT = Freiburg Visual Acuity and Contrast Test, IRR = Incidence-rate ratio, R2 = Coefficient of determination, SOA = Stimulus-onset-asynchrony.