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However, this understanding is less well established in mental health. This study comprises a retrospective observational study carried out on routinely collected data from a large mental healthcare provider. Two databases comprising nurse staffing levels and adverse events were modelled using latent variable methods to account for the presence of multiple underlying behaviours. The analysis reveals a strong dependence of the rate of adverse events on the location and perceived clinical demand of the wards, and a reduction in adverse events where registered nurses exceed \u2018clinically required levels\u2019. In the first study of its kind, these findings present significant implications for nursing workforce policy and present an opportunity to not only improve safety but potentially impact nurse retention.<\/jats:p>","DOI":"10.1177\/1460458219874637","type":"journal-article","created":{"date-parts":[[2019,10,4]],"date-time":"2019-10-04T02:59:01Z","timestamp":1570157941000},"page":"1333-1346","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":13,"title":["An observational study on the rate of reporting of adverse event on healthcare staff in a mental health setting: An application of Poisson expectation maximisation analysis on nurse staffing data"],"prefix":"10.1177","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3343-8271","authenticated-orcid":false,"given":"Robert M","family":"Cook","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4729-4029","authenticated-orcid":false,"given":"Sarahjane","family":"Jones","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2724-3750","authenticated-orcid":false,"given":"Gemma C","family":"Williams","sequence":"additional","affiliation":[{"name":"Birmingham City University, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1574-7698","authenticated-orcid":false,"given":"Daniel","family":"Worsley","sequence":"additional","affiliation":[{"name":"Mersey Care NHS Trust, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ray","family":"Walker","sequence":"additional","affiliation":[{"name":"Health Education England, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mark","family":"Radford","sequence":"additional","affiliation":[{"name":"NHS England and NHS Improvement, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7846-5658","authenticated-orcid":false,"given":"Alison","family":"Leary","sequence":"additional","affiliation":[{"name":"London South Bank University, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2019,10,3]]},"reference":[{"key":"bibr1-1460458219874637","volume-title":"To err is human: building a safer health system","author":"Institute of Medicine (US) Committee on Quality of Health Care in America","year":"2000"},{"key":"bibr2-1460458219874637","volume-title":"World alliance for patient safety : forward programme 2005","author":"World Health Organization (WHO)","year":"2004"},{"key":"bibr3-1460458219874637","unstructured":"NHS England. 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