Figure 2

Prevalence of anemia by day for patients remaining in hospital on each day and having a hemoglobin obtained that day. ICU patients refers to those who spent at least one day in the ICU. Non-ICU patients were never admitted to the ICU. During the first week, the majority of hemoglobin values were obtained from non-ICU patients. After day 7, those still remaining in the hospital and providing daily hemoglobin values were more likely to have spent at least one day of their hospital stay in the ICU. Despite this, 2/3 (341 of 511) of those with moderate to severe anemia were non-ICU patients.