Table 1.

Participant and Informant Driving Characteristics

Characteristic	Control (CDR = 0) (n = 25)	Very Mild AD (CDR = 0.5) (n = 33)	Mild AD (CDR = 1.0) (n = 17)	F/Chi-Square	P-value
Age, mean ± SD	72.4 ± 10.2	77.1 ± 5.3	73.2 ± 8.3	2.81	.07
Sex, M/F	10/15	21/12	10/7	3.36	.19
Education, mean ± SD	14.7 ± 3.0	13.6 ± 3.5	12.5 ± 3.4	2.14	.13
Mini-Mental State Examination score, mean ± SD*	29.1 ± 1.2	24.9 ± 3.6	21.5 ± 3.9	31.15	.00
Driving miles/month, mean ± SD	133.8 ± 96.9	65.4 ± 60.7	75.7 ± 83.4	5.45	.01
≥1 accidents/3 years, n†	1	8	4	5.22	.27
≥1 traffic violations/3 years, n†	3	2	1	3.04	.52
Total driving score, mean ± SD‡	5.2 ± 5.2	13.8 ± 8.4	13.1 ± 9.7	9.54	.00
Informant sex, M/F	3/19	9/28	3/13	3.36	.19
Miles driven with informant/month, mean ± SD	31.7 ± 66.0	36.5 ± 59.5	16.8 ± 18.5	0.73	.48

^*Range 0 (worst) to 30 (best).

^†Number of participants who had one or more accidents/violations over the previous 3 years.

^‡Range 0 (best) to 108 (worst).

AD = Alzheimer’s disease; SD = standard deviation; M = male; F = female; CDR = Clinical Dementia Rating Scale.