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

Appendix E: Descriptive Statistics  for Mobility Questionnaire by Sample

Variable names and definitions

• AGETEST Age of subject at the time of test
• DAYSWEEK Number of days per week subject drives (1-7)
• MILESYEAR Number of miles per year subject drives:
• 1=Less than 1,000
• 2= 1,001 to 2,500 0
• 3=2,501 to 5,000
• 4=5,001 to 7,500
• 5=7,501 to 10,000
• 6=10,001 to 12,500
• 7=12,501 to 15,000
• 8=15,001 to 17,50
• 9=17,501 to 20,000
• 10=20,001 to 25,000
• 11=25,001 to 30,000
• 12=30,001 or more
• AVDNIGHT Avoid night driving?
1=never; 2=rarely; 3=sometimes; 4=usually; 5=always
• AVDLEFTTURN Avoid left turns?
1=never; 2=rarely; 3=sometimes; 4=usually; 5=always
1=never; 2=rarely; 3=sometimes; 4=usually; 5=always
• AVDTRAFFIC Avoid heavy traffic?
1=never; 2=rarely; 3=sometimes; 4=usually; 5=always
1=never; 2=rarely; 3=sometimes; 4=usually; 5=always
• PASSOPPS Pass up opportunities to go shopping, visit with friends, etc., because of concerns about driving?
1=never; 2=rarely; 3=sometimes; 4=usually; 5=always
Table 24.
Descriptive Statistics for Self-Reported Responses by the
MVA Renewal Sample
on the Mobility Questionnaire,
for Categorical Questions
AGETEST DAYSWEEK MILESYEAR AVDNIGHT AVDLEFTTURN
Number of cases 1876 1868 1871 1871 1871
Minimum 55.00 0.00 0.00 0.00 0.00
Maximum 96.00 7.00 12.00 5.00 5.00
Sum 128098.00 10018.00 8407.00 4315.00 3495.00
Median 68.00 6.00 4.00 2.00 1.00
Mean 68.28 5.36 4.49 2.31 1.87
95% CI Upper 68.64 5.45 4.62 2.37 1.93
95% CI Lower 67.92 5.28 4.36 2.24 1.81
Standard Error 0.18 0.04 0.07 0.03 0.03
Standard Deviation 7.92 1.89 2.84 1.48 1.36
Number of cases 1871 1869 1870 1871
Minimum 0.00 0.00 0.00 0.00
Maximum 5.00 5.00 5.00 5.00
Sum 4391.00 3602.00 3833.00 2225.00
Median 2.00 1.00 1.00 1.00
Mean 2.35 1.93 2.05 1.19
95% CI Upper 2.41 1.99 2.11 1.22
95% CI Lower 2.29 1.87 1.99 1.16
Standard Error 0.03 0.03 0.03 0.01
Standard Deviation 1.36 1.34 1.35 0.64

 AGETEST DAYSWEEK MILESYEAR AVDNIGHT AVDLEFTTURN Number of cases 266 261 264 265 264 Minimum 56.00 1.00 1.00 1.00 1.00 Maximum 92.00 7.00 10.00 5.00 5.00 Sum 20505.00 1438.00 941.00 763.00 520.00 Median 78.00 6.00 3.00 3.00 1.00 Mean 77.09 5.51 3.56 2.88 1.97 95% CI Upper 77.91 5.72 3.79 3.06 2.14 95% CI Lower 76.26 5.30 3.34 2.70 1.80 Standard Error 0.42 0.11 0.11 0.09 0.09 Standard Deviation 6.81 1.76 1.85 1.46 1.40
 AVDBAD AVDTRAFFIC AVDUNFAM PASSOPPS Number of cases 265 265 265 265 Minimum 1.00 1.00 1.00 1.00 Maximum 5.00 5.00 5.00 5.00 Sum 726.00 688.00 641.00 399.00 Median 3.00 3.00 2.00 1.00 Mean 2.74 2.60 2.42 1.51 95% CI Upper 2.90 2.77 2.59 1.63 95% CI Lower 2.58 2.42 2.25 1.38 Standard Error 0.08 0.09 0.09 0.06 Standard Deviation 1.32 1.47 1.40 1.00

Table 26.
Descriptive Statistics for Self-Reported Responses by the
Medical Referral Sample
on the Mobility Questionnaire,
for Categorical Questions
AGETEST DAYSWEEK MILESYEAR AVDNIGHT AVDLEFTTURN
Number of cases 366 307 306 305 306
Minimum 55.00 1.00 1.00 1.00 1.00
Maximum 95.00 7.00 12.00 5.00 5.00
Sum 28127.00 1429.00 1011.00 936.00 662.00
Median 79.00 5.00 3.00 3.00 1.00
Mean 76.85 4.65 3.30 3.07 2.16
95% CI Upper 77.81 4.88 3.56 3.25 2.33
95% CI Lower 75.88 4.43 3.04 2.89 2.00
Standard Error 0.49 0.11 0.13 0.09 0.08
Standard Deviation 9.39 1.97 2.32 1.61 1.48