Background: Adequate nursing staff to meet the demands of patient care in intensive care units (ICUs) is a goal pursued by all health care systems in the world. Purpose:Thepurposeofthisstudywastodescribethe nursingworkload, the quantity and composition ofnursing staff, and the patient-to-nurse ratio in ICUs from different countries considering the application of the Nursing Activities Score (NAS) for the adequa...