Inclusion criteria: | • Studies investigating the association between staffing (e.g. nurse-to-patient ratio or work hours per patient or patient day) and a) nursing outcomes (e.g. job satisfaction, nurse vacancy rate, nurse turnover rate, nurse retention rate) or b) patient outcomes (e.g. mortality, adverse drug events, nurse quality outcomes, length of stay; patient satisfaction with nursing care) |
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Exclusion criteria: | • Studies not published in English |
 | • Studies including a target population of outpatients and patients in long-term care facilities |
 | • Studies with no information relevant to nurse staffing policies and strategies |
 | • Studies examining the contributions of advance practice nurses (nurse practitioners, nurse clinicians, certified nurse midwives, nurse anesthetists) |
 | • Administrative reports and single-hospital studies that did not include control comparisons and did not test an associative hypothesis |
 | • Systematic or non-systematic reviews |
 | • Editorials, letters, non-original research |