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Table 2 Comparison of current and retired drivers with cognitive impairment on predictor variables

From: Adherence to driving cessation advice given to patients with cognitive impairment and consequences for mobility

 

Group

p Value (df)

Current drivers (n = 104)

Retired drivers (n = 68)

Intrapersonal factors

 Age in years, mean (SD), y

70.2 (8.7)

73.0 (8.7)

.032 (171)a*

 Male sex, No. (%)

83 (79.8%)

45 (66.2%)

.051 (1)b

 Diagnosis of AD, No. (%)

53 (51.0%)

40 (58.8%)

.035 (1)b*

 CDR-score, No. (%)

  0

15 (14.4%)

1 (1.5%)

<.001 (2)c*

  0.5

86 (82.7%)

44 (64.7%)

  1

3 (2.9%)

23 (33.8%)

 MMSE-score, mean (SD)

24.9 (3.5)

22.4 (4.2)

<.001 (171)a*

 Health decline, No. (%)

  No

76 (73.1%)

33 (49.2%)

.004 (2)c*

  To some extent

7 (6.7%)

5 (7.5%)

  Yes

21 (20.2%)

29 (43.3%)

 Visual acuity (0–1), mean (SD)

.88 (0.21)

.84 (0.21)

.181 (169)a

 Contrast sensitivity (0–16), mean (SD)

12.84 (0.68)

12.55 (0.96)

.022 (170)a*

 Importance of driving, mean (SD)

1.57 (0.73)

1.78 (0.83)

.091 (171)a

 Patient’s judgement of driving safety, No. (%)

  Safe

88 (85.4%)

52 (76.5%)

.136 (2)c

  Less safe than when middle-aged

15 (14.6%)

16 (23.5%)

  Unsafe

0 (0.0%)

0 (0.0%)

Interpersonal factors

 Recommendation given after fitness-to-drive assessment, No. (%)

  Continue driving

73 (92.4%)

6 (7.6%)

<.001 (2)c*

  Driving lessons

18 (58.9%)

13 (41.9%)

  Cease driving

13 (21.0%)

49 (79.0%)

 Authority figure recommended driving cessation, No. (%)

1 (1.0%)

12 (17.6%)

<.001 (1)b*

 Informant’s judgement of driving safety, No (%)

  Safe

68 (66.6%)

42 (64.6%)

.190 (2)c

  Less safe than when middle-aged

32 (31.4%)

18 (27.7%)

  Unsafe

2 (2.0%)

5 (7.7%)

Environmental factors

 Passenger of other drivers, No. (%)

90 (86.5%)

65 (95.6%)

.067 (1)b

 Sum of modes of transport used other than the private car, mean (SD)

2.48 (0.83)

2.12 (1.04)

.013 (168)a*

 Car accidents, mean (SD)

0.10 (0.33)

0.16 (0.51)

.484 (171)a

Process of driving cessation

 Driving reduction, mean (SD)

−1.49 (1.49)

− 1.83 (1.72)

.151 (168)a

 Driving restriction, mean (SD)

1.85 (1.77)

2.34 (2.30)

.343 (170)a

  1. aMann-Whitney U test
  2. bFisher’s Exact test
  3. cχ2 test
  4. Statistical significance (p < .05) is indicated by*
  5. Abbreviations: AD Alzheimer’s disease, CDR-score Clinical Dementia Rating Total Score, MMSE-score Mini Mental State Examination Total Score
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BMC Geriatrics

ISSN: 1471-2318

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