Although those groups were too small to be significant imo I don't think anyone will argue that people with cognitive difficulties, no matter what their diagnosis, are at risk to have increased motor vehicle accidents. Some of these "studies" that actually get published amaze me.

Like this one:
A diagnosis of HIV infection evoked strong and long lasting emotional reactions in women. Stevens PE, Hildebrandt E.

Really??? I'd have never guessed that being diagnosed with a chronic, life threatening disease would evoke strong and lasting emotional reactions, snort.