Table 2:

Selected diseases, risks and effectiveness of medical warnings in preventing motor vehicle collisions

Disease	Event rate*		RR (95% CI)
	At baseline	After warning
Dementia	2.92	0.86	0.31 (0.18–0.58)
Stroke	3.5	1.15	0.32 (0.19–0.60)
Depression	8.75	3.6	0.38 (0.25–0.60)
Syncope	5.91	2.95	0.49 (0.38–0.64)
Epilepsy	5.92	3.23	0.53 (0.36–0.78)
Diabetes	4.49	2.71	0.59 (0.43–0.82)
Sleep disorder	6.1	3.85	0.62 (0.46–0.85)
Alcoholism	7.24	4.91	0.64 (0.46–0.91)

Note: Data adapted from Redelmeier and colleagues.³⁰ CI = confidence interval, RR = risk ratio.

^*The benchmark rate in the general population is about 1.96 serious crashes per 1000 drivers annually.