{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,30]],"date-time":"2026-06-30T06:55:26Z","timestamp":1782802526483,"version":"3.54.5"},"reference-count":24,"publisher":"BMJ","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Epidemiol Community Health"],"accepted":{"date-parts":[[2011,4,7]]},"published-print":{"date-parts":[[2012,5]]},"abstract":"<jats:sec>\n                  <jats:title>Background<\/jats:title>\n                  <jats:p>Amid the calls for \u2018more public health evidence\u2019, we also need simple understandable methods of determining when more research really is needed. This paper describes a simple decision aid to help policymakers, researchers and other decision makers assess the potential \u2018information value\u2019 of a new public health randomised controlled trial.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods<\/jats:title>\n                  <jats:p>The authors developed a flow chart to help make explicit (1) the user's <jats:italic>information needs<\/jats:italic>, (2) the <jats:italic>intended use<\/jats:italic> of the new information that the study will produce, (3) the <jats:italic>added value<\/jats:italic> of the evidence to be derived from the new study and (4) the levels of <jats:italic>precision, bias and generalisability<\/jats:italic> required by the user.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>The flow chart is briefly illustrated, first in generic form and then in a worked example, showing how it may be used in deciding whether a new study should be commissioned to evaluate the health impact of allowing motorcycles to use bus lanes in London.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusions<\/jats:title>\n                  <jats:p>In this paper, the authors have presented a flow chart for enacting an informal \u2018Value-of-Information\u2019-like approach to deciding when a new public health evaluation is needed. The authors do not suggest that the flow chart approach is technically the equivalent of Value-of-Information methods. Nonetheless, it represents a valuable perspective and process to adopt, and this structured approach will be more revealing than an unstructured thought experiment as the basis for decisions about a new study. To aid in its development as an effective tool, we invite users from a variety of perspectives and contexts to review it, to use it in practice and to send us their comments.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1136\/jech.2010.116483","type":"journal-article","created":{"date-parts":[[2011,6,7]],"date-time":"2011-06-07T23:15:43Z","timestamp":1307488543000},"page":"391-396","source":"Crossref","is-referenced-by-count":28,"title":["To RCT or not to RCT: deciding when \u2018more evidence is needed\u2019 for public health policy and practice"],"prefix":"10.1136","volume":"66","author":[{"given":"Mark","family":"Petticrew","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zaid","family":"Chalabi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David R","family":"Jones","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2011,6,7]]},"reference":[{"key":"2025100301222985000_66.5.391.1","unstructured":"Wanless D . 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