Table 3.

GEE Poisson Regression Model Assessing Changes in the Number of Situations Drivers with and without Suspected MCI Self-Regulated Their Driving, Over One Year (n=670)

	IRR	95% CI		p-value
Cognition
No cognitive impairment*	1
Suspected MCI	1.13	1.02	1.27	0.025**
Time
Baseline*	1
Follow-up	0.92	0.84	1.01	0.066
Gender
Male*	1
Female	1.87	1.52	2.32	0.001**
Age Group
65–69 years*	1
70–74 years	0.98	0.83	1.15	0.812
75+ years	1.33	1.10	1.60	0.003**
Marital Statusa
Married/De facto*	1
Single/Separated/Divorced/Widowed	0.98	0.83	1.17	0.860
Number of Comorbidities
None*	1
1–3	1.26	1.01	1.58	0.040**
4+	1.39	1.08	1.78	0.011**
Crashes
None*	1
≥1	1.03	0.82	1.30	0.811
Traffic Infringements
None*	1
≥1	0.80	0.67	0.95	0.011**
Change in Driving Confidence
Increase/No change*	1
Decrease	1.32	1.10	1.58	0.003**
Preference of transport
Drive self*	1
Someone else driving	1.38	1.12	1.70	0.003**

Notes: *Reference category. **p<0.05. ^aMissing information.

Abbreviations: MCI, mild cognitive impairment; IRR, incidence rate ratio; CI, confidence interval.