Model
Driver Screening and Evaluation Program
Volume II: Maryland Pilot Older Driver Study |
Appendix G:
Chi-Square Tables for Tests of Significance at Peak Valid Odds Ratio Values for
Crash Data
The following output from SYSTAT is all based on the calculated odds ratio values
presented in appendix G. In the tables that follow, drivers with 1 or more (at-fault) crashes
1 year prior and up to 3 years after testing were assigned a (-1); this is done to ensure that the
crashing group appears in the left column, which is important for calculating odds ratios.
Cutoffs were obtained from the peak valid OR calculated for each measure listed below,
as reported in the analysis and results chapter. The failing criteria (coded as a 0 in the first row)
for each of the performance measures is as follows:
- MVPT/VC: 5 or more responses are incorrect
- Delayed Recall: 2 or more responses are incorrect
- Useful Field of View Subtest 2: Target duration is 275 msec or longer
- Trail Making Part B: Completion time is 80 seconds or more
- Dynamic Trails: Completion time is 22.5 seconds or more
- Rapid Pace Walk Time: Completion time is 9 seconds or more
- Foot Tap Time: Completion time is 6 seconds or more
- Head/Neck Rotation: N/A (binary measure)
Table 48.
Frequencies of At-fault Crashes in the MVA Renewal Sample,
as a
Function of Performance on the MVPT/VC
(OR=4.96, x2 = 26.48, df=1, p<.001)
| |
-1 |
0 |
Total |
|---|
| 0 |
13 |
147 |
160 |
|---|
| 1 |
30 |
1682 |
1712 |
|---|
| Total |
43 |
1829 |
1872 |
|---|
Table 49.
Frequencies of At-fault Crashes in the MVA Renewal Sample,
as a
Function of Performance on the Delayed Recall Test
(OR=2.92, x2 = 5.25, df=1,
p<.02)
| |
-1 |
0 |
Total |
|---|
| 0 |
5 |
82 |
87 |
|---|
| 1 |
36 |
1726 |
1762 |
|---|
| Total |
41 |
1808 |
1849 |
|---|
Table 50.
Frequencies of At-fault Crashes in the MVA Renewal Sample,
as a
Function of Performance on the Useful Field of View Subtest 2
(OR=2.34, x2 =
6.95, df=1, p<.01)
| |
-1 |
0 |
Total |
| 0 |
17 |
438 |
455 |
| 1 |
21 |
1264 |
1285 |
| Total |
38 |
1702 |
1740 |
Table 51.
Frequencies of At-fault Crashes in the MVA Renewal Sample,
as a
Function of Performance on the Trail-Making Part B Test
(OR=3.50, x2 = 7.72,
df=1, p<.01)
| |
-1 |
0 |
Total |
|---|
| 0 |
36 |
1224 |
1260 |
|---|
| 1 |
5 |
595 |
600 |
|---|
| Total |
41 |
1819 |
1860 |
|---|
Table 52.
Frequencies of At-fault Crashes in the MVA Renewal Sample,
as a
Function of Performance on the Dynamic Trails Test
(OR=1.45, x2 = 0.57, df=1,
p<.45)
| |
-1 |
0 |
Total |
| 0 |
10 |
377 |
387 |
| 1 |
7 |
383 |
390 |
| Total |
17 |
760 |
777 |
Table 53.
Frequencies of At-fault Crashes in the MVA Renewal Sample,
as a
Function of Performance on the Rapid Pace Walk
(OR=2.64, x2 = 6.11, df=1,
p<.01)
| |
-1 |
0 |
Total |
|---|
| 0 |
8 |
153 |
161 |
|---|
| 1 |
30 |
1512 |
1542 |
|---|
| Total |
38 |
1665 |
1703 |
|---|
Table 54.
Frequencies of At-fault Crashes in the MVA Renewal Sample,
as a
Function of Performance on the Foot Tap Test
(OR=1.50, x2 = 0.98, df=1, p<.32)
| |
-1 |
0 |
Total |
| 0 |
12 |
552 |
564 |
| 1 |
12 |
828 |
840 |
| Total |
24 |
1380 |
1404 |
Table 55.
Frequencies of At-fault Crashes in the MVA Renewal Sample,
as a
Function of Performance on the Head/Neck Rotation Test
(OR=2.56, x2 = 4.69,
df=1, p<.03)
| |
-1 |
0 |
Total |
|---|
| 0 |
8 |
215 |
223 |
|---|
| 1 |
14 |
964 |
978 |
|---|
| Total |
22 |
1179 |
1201 |
|---|
BACK |
CONTENTS
| NEXT