Patient characteristics.

<p>Data are count (percentage) except where noted as mean (standard deviation).</p>a<p>Includes myocardial infarction.</p>b<p>Includes sweating or any other signal symptom.</p>c<p>Defined as requiring outside assistance.</p

Crash risk in different subgroups.

<p>Each analysis examines correlation of lower HbA1c levels with higher risk of a crash. Results expressed as odds ratio (solid circle) and 95% confidence interval (horizontal line) per 1% point decrease in HbA1c. Analyses of chronic complication subgroups exclude patients reporting corresponding symptom. Results for full cohort appear at bottom and show an odds ratio of 1.26 with 95% confidence interval 1.03–1.54.</p