“…Many studies have assessed associations between patient characteristics such as age, gender, severity of illness, reason for admission, and developmental delay in order to identify risk factors for development of delirium with varying results. Nine studies looked for associations between delirium and age with eight studies finding an association [5,15,19,20,21,22,23,24,25]. However, two found that delirium was associated with older age (>12 years) [19,20], while the other six found that delirium was associated with associated with younger age (<2, <5, or 2–5 years) [5,15,21,22,23,24].…”