what's the difference between "CPU I/O Wait" and "db scatter/sqenecail wait"

In the EM, we can view the CPU usage at the server(OS) level that the CPU I/O wait is very high.
And from the database level, statspack will tell use the time about IO, such as scatter read or sequential read. Is the time spent on scatter/sequential read in the eye of oracle is the same or at least related to the "CPU I/O wait' at the unix level?

--
http://www.freelists.org/webpage/oracle-l