Model Driver Screening and Evaluation Program
Volume II: Maryland Pilot Older Driver Study

 

Appendix I:
Chi-Square Tables for Tests of Significance at Peak Valid Odds Ratio Values for Violation Data

The following output from SYSTAT is all based on the calculated odds ratio values presented in appendix I. In the tables that follow, the drivers with 1 or more violations (non-speeding and occupant restraint) 1 year prior and up to 3 years after testing were assigned a (-1); this is done to ensure that the group with violations appears in the left column which is important for calculating odds ratio.

Cutoffs were obtained from the peak valid OR calculated for each measure listed below, as reported in the analysis and results chapter of the report. Peak OR was found in analysis of moving violations without speeding and occupant restraint for some measures; for moving violations without speeding for other measures; and in one case, for all moving violations, as noted in the body of the report and in the table titles that follow. The failing criteria (coded as a 0 in the first row) for each of the performance measures is as follows:

Table 77.
Frequencies of Violations (Without Speeding or Occupant Restraint)
in the MVA Renewal Sample, as a Function of Performance on the MVPT/VC
(OR=4.53, x2 =10.83, df=1, p<.001)
  -1 0 Total
0 5 75 80
1 26 1766 1792
Total 31 1841 1872

 

Table 78.
Frequencies of Violations (Without Speeding or Occupant Restraint) 
in the MVA Renewal Sample, as a Function of Performance on the Delayed Recall Test
(OR=1.72, x2 =1.58, df=1, p<.21)
  -1 0 Total
0 7 264 271
1 24 1554 1578
Total 31 1818 1849

 

Table 79.
Frequencies of Violations (Without Speeding or Occupant Restraint) 
in the MVA Renewal Sample, as a Function of Performance 
on the Useful Field of View Subtest 2
(OR=1.67, x2 =1.53, df=1, p<.22)
  -1 0 Total
0 21 1046 1067
1 8 665 673
Total 29 1711 1740

 

Table 80.
Frequencies of Violations (Without Speeding) in the MVA Renewal Sample, 
as a Function of Performance on the Trail-making Part B Test
(OR=1.72, x2 =6.70, df=1, p<.01)
  -1 0 Total
0 40 498 538
1 59 1263 1322
Total 99 1761 1860

 

Table 81.
Frequencies of Violations (Without Speeding or Occupant Restraint) 
in the MVA Renewal Sample, as a Function of Performance 
on the Dynamic Trails Test
(OR=1.27, x2 =.24, df=1, p<.62)
  -1 0 Total
0 10 377 387
1 8 382 390
Total 18 759 777

 

Table 82.
Frequencies of Violations (Without Speeding) in the MVA Renewal Sample,
as a Function of Performance on the Rapid Pace Walk Test 
(OR=1.48, x2 =.96, df=1, p<.33)
  -1 0 Total
0 82 1433 1515
1 7 181 188
Total 89 1614 1703

 

Table 83.
Frequencies of Violations (All Moving Violations) in the MVA Renewal Sample, 
as a Function of Performance on the Foot Tap Test 
(OR=2.14, x2 =2.34, df=1, p<.13)
  -1 0 Total
0 5 19 24
1 151 1229 1380
Total 156 1248 1404

 

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