“…It has been estimated that each additional patient per nurse is associated with a 7% increase in the likelihood of death and failure to rescue (Aiken, Clarke, Sloane, Sochalski, & Silber, 2002), a 10% increase in the proportion of registered nurses (RNs) is associated with a 9.5% decrease in the odds of acquiring pneumonia (Cho, Ketefian, Barkauskas, & Smith, 2003), and a 10% increase in nurses with a bachelor's degree is associated with a decreased likelihood of patient mortality by roughly 7% (Aiken et al., 2014). Similar findings have been found in other studies (Chang, Yen, Chang, & Liu, 2017; Kim & Bae, 2018). The indices of nurse staffing commonly used in studies are the number of nurses (e.g., the nurse‐to‐patient ratio and nursing hours per patient day) and skill mix (e.g., usually defined as the proportion of RNs or percentage of nursing hours provided by RNs) (Jacob, McKenna, & D'Amore, 2015; Twigg, Kutzer, Jacob, & Seaman, 2019).…”