Jill Tucker, RN says:

“Nurse-to-patient hospital staffing ratios continue to be challenged as institutions seek cost cuts and shift the care burden onto fewer nurses. But a recent study indicates that patient hospital stays are shorter (and less costly) when staff nurses have greater tenure, and that nurse teams are more efficient the longer they remain together.
When It Comes to Cost and Quality of Hospital Care, Nurse Tenure and Teamwork Count

RWJF.org  May 27, 2014