2. METHODS
The retrospective analysis was based on 2008 data obtained from the
National Sample Survey of Registered Nurses (NSSRN). Since 1977, the
Health Resources and Services Administration (HRSA) has overseen the
collection of NSSRN data every four years18. The NSSRN
contains the central data repository workforce estimates for nurses in
the United States, including household income, demographic
characteristics, training, etc.19. The unit of
analysis is the nurse.