Study	Reason for exclusion
Auerbach 2014	Not a report of original data
Birgegard 2010	No non‐iron control group
Cho 2011	No non‐iron control group
Earley 2004	No control group
Earley 2005	No control group
Ekermo 2013	No non‐iron control group
Halterman 2007	Duplicate publication of Sloand 2004 (included)
Konofal 2008	Included children
Macher 2015	No non‐iron control group
Mohri 2008	No control group; included children
NCT00895232	No non‐iron control group
O'Keeffe 1994	Performed prior to 1995 (non‐standard diagnostic criteria for RLS used); no control group
Ondo 2010	No control group
Simakajornboon 2003	No control group; included children
Vishwakarma 2013	Iron group also given folate, while other treatment groups were not given folate
Zhang 2014	No non‐iron control group
Zilberman 2010	No control group

RLS: restless legs syndrome