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

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
  AVDBAD AVDTRAFFIC AVDUNFAM PASSOPPS
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

 

Table 25.
Descriptive Statistics for Self-Reported Responses by the 
Residential Community on the Mobility Questionnaire,
for Categorical Questions
 
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
  AVDBAD AVDTRAFFIC AVDUNFAM PASSOPPS
Number of cases 306 305 306 306
Minimum 1.00 1.00 1.00 1.00
Maximum 5.00 5.00 5.00 5.00
Sum 937.00 797.00 880.00 498.00
Median 3.00 2.00 3.00 1.00
Mean 3.06 2.61 2.88 1.63
95% CI Upper 3.23 2.79 3.05 1.75
95% CI Lower 2.90 2.44 2.70 1.50
Standard Error 0.08 0.09 0.09 0.06
Standard Deviation 1.46 1.53 1.59 1.09

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