is it correct?

[bartholomew]

8 out of 11 patients (73%) reported that they were give reasons why they were being placed under observation.

or maybe 8 out of the 11 patients

[B00]

Eh?

[THECORBYLOON]

I would say it is "eight out of the 11 patients" as it sounds like a specific sample. If 1000 were sampled and 800 gave a certain response, I would say "800 out of the 1000" because it refers to a specific number but " eight out of 10" or "80 out of 100" because that is the equivalent. 

[smee.tracey]

Excuse me please, what are you talking about? I don't like being out of the loop.
Hello corbyloo, remember me?!!