“…In evaluating decision making capacity, investigators used as an outcome measure either an assessment of global capacity or a particular capacity criterion. The studies using global measures of capacity 28 , 33 , 37 , 45 , 69 , 77 , demonstrated a range of capacity within the study population, suggesting that certain subsets of the population do need a formal evaluation of decision‐making capacity. The particular criteria evaluated for assessing decision‐making capacity included the rationality of a choice, 31 , 59 , 60 , 79 , 80 patient's appreciation of illness, 31 , 37 , 59 understanding, 23 , 37 , 59 , 97 evidence of a choice, 59 and reasonableness of choice 59 .…”