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

 

Appendix F:
Raw SYSTAT Output for 
Odds Ratio Calculations with 
Crashes at the Outcome Measure

 

Example Key
Case number MVPT PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 0.00 25.23 30.55 28.00 538.00 .
2 1.00 25.23 25.89 56.00 994.00 1.30
3 2.00 16.22 17.72 74.00 1306.00 1.27
4 3.00 7.21 11.19 82.00 1503.00 1.44
5 4.00 9.91 6.59 93.00 1619.00 2.06
6 5.00 11.71 3.80 106.00 1686.00 2.21
7 6.00 0.90 2.16 107.00 1724.00 1.06
8 7.00 3.60 1.14 111.00 1744.00 1.74
9 8.00 0.00 0.57 111.00 1754.00 .
10 9.00 0.00 0.28 111.00 1759.00 .
11 10.00 0.00 0.06 111.00 1760.00 .
12 11.00 0.00 0.06 111.00 1761.00 .

MVPT [Note: This variable name changes for each performance measure.]: The values are the actual labels for bins in the corresponding plots. [NOTE: For continuous measures, the bins represent the midpoint of the interval containing a range of values. The range can be determined by taking the difference between bin values. Half of the range is then subtracted from the bin label to obtain minimum value included in the bin (> minimum value) and half of the range is added to the bin label to obtain maximum value included in the bin (<= maximum value.]

PERCENTPOS: This is the percent of total positive events (i.e., the event occurred - crash or conviction - which is positive eventů.gets very confusing) that occur for an individual with a corresponding score on the performance measure. For example, in the table above 24.49% of drivers (or 48 divided by 196 drivers with convictions) with positive events (outcome event occurs) had a score of 0 on MVPT. For each row, PERCENTPOS is the number of cases in the bin divided by total number of positive events.

PERCENTNEG: Same as above variable calculated separately for drivers without negative event convictions.

PERCENTPOS and PERCENTNEG are used to plot distributions in the OR plots. The conversion to percentages of the distribution allows direct comparison of the shapes of the distributions.

The following variables are used to calculate odds ratios:

SUMPASSPOS: Cumulative number of drivers for whom the outcome event occurred.

SUMPASSNEG: Cumulate number of drivers for whom the outcome event did not occur.

NPOS: Number of drivers for whom event occurred which is the number in the last bin for SUMPASSPOS

NNEG: Number of drivers for whom event did not occur which is the number in the last bin for SUMPASSNEG

ODDSRATIO: Odds ratio calculated using formula (a/b)/(c/d) where values are as follows:

a = NPOS - SUMPASSPOS

b = NNEG - SUMPASSNEG

c = SUMPASSPOS

d = SUMPASSNEG

NOTE: The number of drivers who fail at each performance level for a given measure is found by taking the highest value for the "SUMPASSPOS" column, then subtracting the "SUMPASSPOS" value for the performance level immediately above in these appendix tables. For MVPT level = 5.00, above, the number who fail is found by taking the highest SUMPASSPOS value (111), then subtracting the SUMPASSPOS value for MVPT level = 4.00 (93); therefore, the number who failed at MVPT level = 5.00 is 18.

Table 27. 
MVPT/VC Odds Ratios for the Mva Renewal Sample, for All Crashes
Case number MVPT PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 0.00 25.23 30.55 28.00 538.00 .
2 1.00 25.23 25.89 56.00 994.00 1.30
3 2.00 16.22 17.72 74.00 1306.00 1.27
4 3.00 7.21 11.19 82.00 1503.00 1.44
5 4.00 9.91 6.59 93.00 1619.00 2.06
6 5.00 11.71 3.80 106.00 1686.00 2.21
7 6.00 0.90 2.16 107.00 1724.00 1.06
8 7.00 3.60 1.14 111.00 1744.00 1.74
9 8.00 0.00 0.57 111.00 1754.00 .
10 9.00 0.00 0.28 111.00 1759.00 .
11 10.00 0.00 0.06 111.00 1760.00 .
12 11.00 0.00 0.06 111.00 1761.00 .

 

Table 28.
MVPT/VC Odds Ratios for the Mva Renewal Sample, 
for At-fault and Unknown-fault Crashes
Case number MVPT PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 0.00 19.40 30.64 13.00 553.00 .
2 1.00 25.37 25.87 30.00 1020.00 1.83
3 2.00 13.43 17.78 39.00 1341.00 1.60
4 3.00 8.96 11.02 45.00 1540.00 2.07
5 4.00 10.45 6.65 52.00 1660.00 2.84
6 5.00 14.93 3.88 62.00 1730.00 3.30
7 6.00 1.49 2.11 63.00 1768.00 1.86
8 7.00 5.97 1.11 67.00 1788.00 3.03
9 8.00 0.00 0.55 67.00 1798.00 .
10 9.00 0.00 0.28 67.00 1803.00 .
11 10.00 0.00 0.06 67.00 1804.00 .
12 11.00 0.00 0.06 67.00 1805.00 .

 

Table 29.
MVPT/VC Odds Ratios for the Mva Renewal Sample,
for At-fault-only Crashes
Case number MVPT PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 0.00 13.95 30.62 6.00 560.00 .
2 1.00 23.26 25.92 16.00 1034.00 2.72
3 2.00 11.63 17.77 21.00 1359.00 2.19
4 3.00 6.98 11.04 24.00 1561.00 3.03
5 4.00 13.95 6.62 30.00 1682.00 4.61
6 5.00 18.60 3.94 38.00 1754.00 4.96
7 6.00 2.33 2.08 39.00 1792.00 3.08
8 7.00 9.30 1.09 43.00 1812.00 4.97
9 8.00 0.00 0.55 43.00 1822.00 .
10 9.00 0.00 0.27 43.00 1827.00 .
11 10.00 0.00 0.05 43.00 1828.00 .
12 11.00 0.00 0.05 43.00 1829.00 .

 

Table 30.
Delayed Recall Odds Ratios for the MVA Renewal Sample,
for All Crashes
Case number DRINCORREC PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 0.00 59.63 57.59 65.00 1002.00 .
2 1.00 22.02 27.99 89.00 1489.00 0.92
3 2.00 10.09 9.94 100.00 1662.00 1.33
4 3.00 8.26 4.48 109.00 1740.00 1.92

 

Table 31.
Delayed Recall Odds Ratios for the MVA Renewal Sample,
for At-fault and Unknown-fault Crashes
Case number
DRINCORREC
PERCENTPOS
PERCENTNEG
SUMPASSPOS
SUMPASSNEG
ODDSRATIO
1 0.00 60.00 57.57 40.00 1027.00 .
2 1.00 16.92 28.03 51.00 1527.00 0.85
3 2.00 13.85 9.81 60.00 1702.00 1.63
4 3.00 7.69 4.60 65.00 1784.00 1.73

 

Table 32.
Delayed Recall Odds Ratios for the MVA Renewal Sample,
for At-fault-only Crashes
Case number DRINCORREC PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 0.00 53.66 57.80 22.00 1045.00 .
2 1.00 19.51 27.82 30.00 1548.00 1.18
3 2.00 14.63 9.85 36.00 1726.00 2.18
4 3.00 12.20 4.54 41.00 1808.00 2.92

 

Table 33.
Useful Field of View Subtest 2 Odds Ratios 
for the MVA Renewal Sample, for All Crashes
Case number UFOV PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 50.00 38.83 38.67 40.00 633.00 .
2 100.00 7.77 10.69 48.00 808.00 0.99
3 150.00 6.80 10.02 55.00 972.00 1.12
4 200.00 6.80 10.57 62.00 1145.00 1.28
5 250.00 7.77 7.51 70.00 1268.00 1.54
6 300.00 8.74 5.74 79.00 1362.00 1.62
7 350.00 5.83 3.97 85.00 1427.00 1.50
8 400.00 1.94 1.53 87.00 1452.00 1.44
9 450.00 0.97 0.12 88.00 1454.00 1.44
10 500.00 14.56 11.18 103.00 1637.00 1.35

 

Table 34. 
Useful Field of View Subtest 2 Odds Ratios for the MVA Renewal Sample, 
for At-fault and Unknown-fault Crashes
Case number UFOV PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 50.00 33.33 38.87 20.00 653.00 .
2 100.00 11.67 10.48 27.00 829.00 1.27
3 150.00 3.33 10.06 29.00 998.00 1.19
4 200.00 6.67 10.48 33.00 1174.00 1.56
5 250.00 8.33 7.50 38.00 1300.00 1.90
6 300.00 11.67 5.71 45.00 1396.00 1.98
7 350.00 6.67 3.99 49.00 1463.00 1.64
8 400.00 0.00 1.61 49.00 1490.00 1.51
9 450.00 0.00 0.18 49.00 1493.00 1.76
10 500.00 18.33 11.13 60.00 1680.00 1.79

 

Table 35.
Useful Field of View Subtest 2 Odds Ratios for the MVA Renewal Sample,
for At-fault-only Crashes
Case number UFOV PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 50.00 28.95 38.90 11.00 662.00 .
2 100.00 13.16 10.46 16.00 840.00 1.56
3 150.00 5.26 9.93 18.00 1009.00 1.34
4 200.00 2.63 10.52 19.00 1188.00 1.62
5 250.00 7.89 7.52 22.00 1316.00 2.31
6 300.00 10.53 5.82 26.00 1415.00 2.48
7 350.00 10.53 3.94 30.00 1482.00 2.28
8 400.00 0.00 1.59 30.00 1509.00 1.80
9 450.00 0.00 0.18 30.00 1512.00 2.08
10 500.00 21.05 11.16 38.00 1702.00 2.12

 

Table 36.
Trail-Making Part B Odds Ratios for the MVA Renewal Sample,
for All Crashes
Case number TRAILSB PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 20.00 0.00 0.46 0.00 8.00 .
2 60.00 25.69 32.21 28.00 572.00 .
3 100.00 39.45 38.78 71.00 1251.00 1.40
4 140.00 21.10 17.99 94.00 1566.00 1.34
5 180.00 9.17 5.83 104.00 1668.00 1.35
6 220.00 2.75 2.74 107.00 1716.00 0.97
7 260.00 1.83 0.86 109.00 1731.00 0.92
8 300.00 0.00 0.40 109.00 1738.00 .
9 340.00 0.00 0.74 109.00 1751.00 .

 

Table 37.
Trail-Making Part B Odds Ratios for the MVA Renewal Sample, 
for At-fault and Unknown-fault Crashes
Case number TRAILSB PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 20.00 0.00 0.45 0.00 8.00 .
2 60.00 16.92 32.37 11.00 589.00 .
3 100.00 47.69 38.50 42.00 1280.00 2.40
4 140.00 15.38 18.27 52.00 1608.00 1.36
5 180.00 12.31 5.79 60.00 1712.00 2.15
6 220.00 4.62 2.67 63.00 1760.00 1.72
7 260.00 3.08 0.84 65.00 1775.00 1.60
8 300.00 0.00 0.39 65.00 1782.00 .
9 340.00 0.00 0.72 65.00 1795.00 .

 

Table 38. 
Trail-Making Part B Odds Ratios for the MVA Renewal Sample,
for At-fault-only Crashes
Case number TRAILSB PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 20.00 0.00 0.44 0.00 8.00 .
2 60.00 12.20 32.27 5.00 595.00 .
3 100.00 46.34 38.65 24.00 1298.00 3.50
4 140.00 21.95 18.09 33.00 1627.00 1.76
5 180.00 12.20 5.88 38.00 1734.00 2.05
6 220.00 4.88 2.69 40.00 1783.00 1.61
7 260.00 2.44 0.88 41.00 1799.00 1.24
8 300.00 0.00 0.38 41.00 1806.00 .
9 340.00 0.00 0.71 41.00 1819.00 .

 

Table 39.
Dynamic Trails Odds Ratios for the MVA Renewal Sample,
for All Crashes
Case number DYNASECOND PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 10.00 7.84 6.06 4.00 44.00 .
2 15.00 19.61 23.14 14.00 212.00 0.76
3 20.00 15.69 21.49 22.00 368.00 1.09
4 25.00 13.73 16.94 29.00 491.00 1.36
5 30.00 27.45 12.81 43.00 584.00 1.59
6 35.00 5.88 8.54 46.00 646.00 0.77
7 40.00 3.92 4.96 48.00 682.00 0.88
8 45.00 1.96 2.89 49.00 703.00 0.97
9 50.00 1.96 1.79 50.00 716.00 1.25
10 55.00 1.96 1.10 51.00 724.00 1.43
11 60.00 0.00 0.28 51.00 726.00 .

 

Table 40.
Dynamic Trails Odds Ratios for the MVA Renewal Sample, 
for At-fault and Unknown-fault Crashes
Case number DYNASECOND PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 10.00 10.34 6.02 3.00 45.00 .
2 15.00 17.24 23.13 8.00 218.00 0.55
3 20.00 13.79 21.39 12.00 378.00 1.08
4 25.00 20.69 16.58 18.00 502.00 1.45
5 30.00 24.14 13.37 25.00 602.00 1.25
6 35.00 6.90 8.42 27.00 665.00 0.66
7 40.00 3.45 4.95 28.00 702.00 0.59
8 45.00 3.45 2.81 29.00 723.00 0.55
9 50.00 0.00 1.87 29.00 737.00 .
10 55.00 0.00 1.20 29.00 746.00 .
11 60.00 0.00 0.27 29.00 748.00 .

 

Table 41. 
Dynamic Trails Odds Ratios for the MVA Renewal Sample,
for At-fault-only Crashes
Case number DYNASECOND PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 10.00 0.00 6.32 0.00 48.00 .
2 15.00 17.65 23.03 3.00 223.00 .
3 20.00 23.53 21.05 7.00 383.00 1.94
4 25.00 17.65 16.71 10.00 510.00 1.45
5 30.00 23.53 13.55 14.00 613.00 1.43
6 35.00 5.88 8.42 15.00 677.00 0.89
7 40.00 5.88 4.87 16.00 714.00 1.09
8 45.00 5.88 2.76 17.00 735.00 0.97
9 50.00 0.00 1.84 17.00 749.00 .
10 55.00 0.00 1.18 17.00 758.00 .
11 60.00 0.00 0.26 17.00 760.00 .

a

Table 42.
Rapid Pace Walk Odds Ratios for the MVA Renewal Sample,
for All Crashes
Case number WALKTIME PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 3.75 8.74 11.19 9.00 179.00 .
2 5.25 36.89 38.19 47.00 790.00 1.32
3 6.75 28.16 26.56 76.00 1215.00 1.16
4 8.25 15.53 14.69 92.00 1450.00 1.12
5 9.75 6.80 5.56 99.00 1539.00 1.16
6 11.25 2.91 2.06 102.00 1572.00 1.02
7 12.75 0.97 1.12 103.00 1590.00 0.55
8 14.25 0.00 0.62 103.00 1600.00 .

 

Table 43.
Rapid Pace Walk Odds Ratios for the MVA Renewal Sample, 
for At-fault and Unknown-fault Crashes
Case number
WALKTIME
PERCENTPOS
PERCENTNEG
SUMPASSPOS
SUMPASSNEG
ODDSRATIO
1 3.75 6.56 11.21 4.00 184.00 .
2 5.25 37.70 38.12 27.00 810.00 1.80
3 6.75 22.95 26.80 41.00 1250.00 1.23
4 8.25 16.39 14.68 51.00 1491.00 1.56
5 9.75 11.48 5.42 58.00 1580.00 1.94
6 11.25 3.28 2.07 60.00 1614.00 1.32
7 12.75 1.64 1.10 61.00 1632.00 0.96
8 14.25 0.00 0.61 61.00 1642.00 .

 

Table 44.
Rapid Pace Walk Odds Ratios for the MVA Renewal Sample,
for At-fault-only Crashes
Case number WALKTIME PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 3.75 5.26 11.17 2.00 186.00 .
2 5.25 36.84 38.14 16.00 821.00 2.26
3 6.75 26.32 26.67 26.00 1265.00 1.34
4 8.25 10.53 14.83 30.00 1512.00 1.46
5 9.75 15.79 5.41 36.00 1602.00 2.64
6 11.25 5.26 2.04 38.00 1636.00 1.41
7 12.75 0.00 1.14 38.00 1655.00 .
8 14.25 0.00 0.60 38.00 1665.00 .

 

Table 45. 
Foot Tap Odds Ratios for the MVA Renewal Sample,
for All Crashes
Case number TAPTIME PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 3.75 14.47 21.01 11.00 279.00 .
2 5.25 47.37 38.70 47.00 793.00 1.57
3 6.75 22.37 21.91 64.00 1084.00 0.91
4 8.25 9.21 8.66 71.00 1199.00 0.83
5 9.75 3.95 5.12 74.00 1267.00 0.65
6 11.25 2.63 2.79 76.00 1304.00 0.56
7 12.75 0.00 1.66 76.00 1326.00 .
8 14.25 0.00 0.15 76.00 1328.00 .

 

Table 46.
Foot Tap Odds Ratios for the MVA Renewal Sample,
for At-fault and Unknown-fault Crashes
Case number TAPTIME PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 3.75 10.53 20.94 4.00 286.00 .
2 5.25 47.37 38.95 22.00 818.00 2.25
3 6.75 28.95 21.74 33.00 1115.00 1.09
4 8.25 5.26 8.78 35.00 1235.00 0.67
5 9.75 5.26 5.05 37.00 1304.00 0.81
6 11.25 2.63 2.78 38.00 1342.00 0.57
7 12.75 0.00 1.61 38.00 1364.00 .
8 14.25 0.00 0.15 38.00 1366.00 .

 

Table 47.
Foot Tap Odds Ratios for the MVA Renewal Sample,
for At-fault-only Crashes
Case number TAPTIME PERCENTPOS PERCENTNEG SUMPASSPOS SUMPASSNEG ODDSRATIO
1 3.75 8.33 20.87 2.00 288.00 .
2 5.25 41.67 39.13 12.00 828.00 2.90
3 6.75 37.50 21.67 21.00 1127.00 1.50
4 8.25 4.17 8.77 22.00 1248.00 0.64
5 9.75 4.17 5.07 23.00 1318.00 0.86
6 11.25 4.17 2.75 24.00 1356.00 0.92
7 12.75 0.00 1.59 24.00 1378.00 .
8 14.25 0.00 0.14 24.00 1380.00 .

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