In their study, white blood cell counts were assessed for each patient both when they're in the hospital and while they were at home.: within-groups design.
What is blood cell?
Blood cells are the cells that make up the circulatory system and are responsible for transporting oxygen and nutrients throughout the body. They are produced in the bone marrow and are composed of red blood cells, white blood cells, and platelets. Red blood cells are the most abundant type of blood cell, and their primary purpose is to transport oxygen from the lungs to the rest of the body. White blood cells are the body’s defense against infection and help to fight off viruses and bacteria. Platelets are important for blood clotting and help to prevent excessive bleeding. Without these blood cells, the body would be unable to function properly and would be vulnerable to disease.
Hence, the answer is, the design that is suggested here is within-groups.
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