There are several RDI variables in SHHS dataset , can they be used to predict cvd outcomes?
The short answer is yes. More details can be found in the paper titled. "Relation of Sleep-disordered Breathing to Cardiovascular Disease Risk Factors." The PDF is available:http://aje.oxfordjournals.org/content/154/1/50.full.pdf+html.
I think an interesting question here is whether RDIs determined by different desaturation cutoffs give different predictions for CVD outcomes. As Veda notes, there are many RDIs, from rdi0p to rdi5p, not to mention RDI variables broken down by sleep stage and position. The SDB paper posted by Dennis employs the rdi4p which has been used in other SHHS papers as well over the years.