Study	Reason for exclusion
Beynon 2015	The study was an ITS design but had insufficient data points.
Bowden 1993	The study design did not match our inclusion criteria (not an intervention study).
Buswell 2014	The study design did not match our inclusion criteria (not an intervention study), The study group did not match our inclusion criteria (livestock workers).
Carvalho 2016	The study was an ITS design but had insufficient data points.
Chaillol 2010	The study design did not match our inclusion criteria (surveillance data).
Chakravarthy 2014	The study was an ITS design but had insufficient data points.
Cleveland 2007	The study design did not match our inclusion criteria (surveillance data).
Cullen 2006	The study design did not match our inclusion criteria (surveillance study follow up by expert analysis stating which NSI could have been prevented).
Di Bari 2015	The study design did not match our inclusion criteria (assesment study).
Floret 2015	The study design did not match our inclusion criteria (surveillance data).
Ford 2011	The main outcome of the study does not include NSI. “The aim of the evaluation was to assess the range of sharp safety hypodermic needle devices available in the UK, in terms of device performance and user acceptability. The evaluation was not designed to assess reductions in needlestick injury rates.”
Fukuda 2016	The study design was a CBA but the before data was missing.
Goossens 2011	The study design did not match our inclusion criteria (no comparison group).
Gramling 2013	The study design did not match our inclusion criteria (descriptive study).
Grimmond 2014	The study design did not match our inclusion criteria (not an intervention study).
Guerlain 2010	The study design did not match our inclusion criteria (no comparison group).
Hotaling 2009	The study was an ITS design but had insufficient data points.
Iinuma 2005	The study design did not match our inclusion criteria (surveillance data).
Jagger 2010	The study was an ITS design but had insufficient data points.
Kanamori 2016	The study was an ITS design but had insufficient data points.
Kim 2015	The study design did not match our inclusion criteria (compliance study).
Lamontagne 2007	The study design did not match our inclusion criteria (surveillance data).
Laramie 2011	The study design did not match our inclusion criteria (surveillance data).
Lauer 2014	The study was an ITS design but had insufficient data points.
Lipscomb 2010	The study design did not match our inclusion criteria (descriptive study).
Lu 2015	The study was an ITS design but had insufficient data points.
Markkanen 2015	The study design did not match our inclusion criteria (qualitative study).
Massachusetts 2011	The study design did not match our inclusion criteria (surveillance study).
McAllister 2014	The main outcome of the study does not include NSI (study evaluvated patient safety).
Menezes 2014	The study was an ITS design but had insufficient data points.
Montella 2014	The study design did not match our inclusion criteria.
Neo 2016	The study design did not match our inclusion criteria (not about safety‐engineered devices).
Perry 2012a	The study was an ITS design but had insufficient data points.
Pigman 1993	The study was not a field study.
Rajkumari 2015	The study intervention does not match our inclusion criteria (the paper describes effectiveness of interactive classes).
Roff 2014	The paper describes spatter contamintaion by active SED but it is not a controlled study.
Shimatani 2011	The study design did not match our inclusion criteria (CBA but no comparison group).
Sibbitt 2011	The study design did not match our inclusion criteria (no comparison group).
Skolnick 1993	The study was an ITS design but had insufficient data points.
Smith 2013	The main outcome of the study does not include NSI.
Sossai 2016	The study design did not match our inclusion criteria.
Steuten 2010	The study design did not match our inclusion criteria (literature review ‐ not original research).
Tosini 2010	The study design did not match our inclusion criteria (surveillance data).
Unahalekhaka 2015	The study design did not match our inclusion criteria (descriptive study).