The second study is similar to the first in that it evaluated patients with acute ischemic stroke for the prevalence of sleep apnea and compared the functional outcomes of patients with and without sleep apnea at the 3rd month after an acute ischemic stroke (Nair et al., 2019). The type of question being asked is an etiology in that it looks to see if OSA is a risk factor for stroke. The design of the study is under the methodology section and is listed as a prospective observational study. This type of study is also known as a cohort design and as stated by Polit &amp

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