“…Three studies (Frith et al, 2010;Mark & Harless, 2010;Razmus, 2018) examined the relationship between RN hours per patient day and three hospital-acquired conditions, and nonsignificant relationships were found. Two other studies (Frith et al, 2010;Mark & Harless, 2010) Eight studies (Blegen et al, 2011;Dunton, Gajewski, Taunton, & Moore, 2004;Everhart et al, 2014;Kouatly, Nassar, Nizam, & Badr, 2018;Patrician et al, 2017;Shuldham, Parkin, Firouzi, Roughton, & Lau-Walker, 2009;Staggs et al, 2012;Van den Heede et al, 2009) examined the relationship between nursing hours per patient day and seven hospital-acquired conditions. Including hospital-acquired pressure injury (HAPI), falls/unassisted falls, injury falls, central line-associated blood stream infection (CLABSI) and TA B L E 1 Summary of quality assessment of the studies included…”