Study	Reason for exclusion
Aizer 2002	Modelling study using longitudinal data to evaluate multiple policies across multiple jurisdictions without controlling for potential confounders across jurisdictions
Aizer 2006	Modelling study using longitudinal data before and after interventions, but not available for re‐analysis
Atherly 2012	Retrospective cohort study
Bansak 2007	Modelling study using longitudinal data to evaluate multiple policies across multiple jurisdictions without controlling for potential confounders across jurisdictions
Barnett 2010	A retrospective, medical record review study
Bitran 2010	Post‐intervention description and lack of control
Bowblis 2008	Retrospective cohort study
Brown 2004	Post‐intervention description and lack of control
Buchmueller 2008	Post‐intervention description and lack of control
Buratto 2004	Post intervention description and lack of control
Card 2004	Time series study
Carter 2006	Longitudinal repeated measurements after interventions, but no measurements before interventions and no control group
Chen 2009	Cluster‐RCT, but only one site in each comparison group
Choi 2011	Retrospective cohort study
Cogan 2008	Not comparative, before‐after study
Cousineau 2007	Post‐intervention description and lack of control
Cousineau 2011	Non‐comparative, descriptive study
Currie 1996	Non‐comparative, descriptive study
Dave 2010	Time series from 1985 to 1996, no clear intervention time point
Davidoff 2005	Controlled before‐after study, but the baseline was very different between the treatment groups and comparison groups
Dutton 2000	Post‐intervention survey and lack of control
Frenk 2006	Longitudinal surveys and lack of control
Gardner 2008	Post‐intervention description and lack of control
Gordon 2001	Prospective observational study after intervention and no control group
Gresenz 2012	Post‐intervention description and lack of control
Guy 2010	Time series post‐intervention, no data before intervention
Hill 1993	Post‐intervention description and lack of control
Hill 2008	Analysed longitudinal data after intervention and lack of control
Jacobson 2007	Post‐intervention description and lack of control
Kenney 2010	Controlled before‐after study with only one intervention site
Kincheloe 2004	Cross‐sectional study
Lawler 2005	Post‐intervention descriptive study
Lee 2008	Modelling study using longitudinal data to evaluate multiple policy characteristics without controlling for possible confounding factors
Leininger 2007	Case‐control study
Lichtenstein 2005	Qualitative study
Lo Sasso 2004	Observational study, not comparative
Long 2007	Non‐comparative, descriptive study
Mahajan 2005	Post‐intervention description and absence of control
Meyer 2004	Qualitative study
Prado 2010	Before and after intervention in Colombia, but lack of control
Ray 2006	Qualitative study
Shore‐Sheppard 2000	Before and after intervention, but lack of control
Sieben 2000	Choice of control sites is not appropriate because there were significant baseline differences between participants from intervention and control sites for most characteristics, such as race/ethnicity, birthplace, language, employment status and baseline insurance coverage. The data are not enough for re‐analysis
Souares 2010	Before‐after study and absence of control
Thornton 2010	Before and after intervention, but lack of control
Wada 2006	Post‐intervention description and absence of control
Wolfe 2005	Analysed pool of 2‐year data to evaluate multiple insurance policy characteristics with potential confounding factors
Ziegenfuss 2008	Modelling study using longitudinal data before and after interventions, but not available for re‐analysis
Zimmer 2011	Time series study. Two data points before intervention, three data points after intervention