Study	Reason for exclusion
Agarwal 1995	Retrospective study
Arici 1994	Compared stimulated with non‐stimulated cycles. Double and single insemination used
Baroni 2001	Compared different timing methods at different follicle sizes at different times to IUI
Barratt 1989	Endo‐cervical and peri‐cervical insemination
Casadei 2006	Comparing single IUI versus double IUI versus TI with IUI
Cedrin‐Durnerin 1993	Quasi‐randomised trial
Check 1994	Prospective non‐randomised study
Claman 2000	Abstract of an included study
Claman 2004a	Abstract of an included study
Claraz 1989	Intracervical insemination
Costa Franco 2006	Retrospective study design
Diaz 2003a	Inadequate randomisation; random numbers in an open list
Diaz 2003b	Abstract of an excluded study
Diaz 2008	Inadequate randomisation; random numbers in an open list. Same study as Diaz 2003a
Egbase 2003	Inclusion of PCOS women only
Federman 1990	Comparing single versus double insemination. Cross‐over study
Fischer 1993	Investigates the time interval from hCG administration to follicular wall rupture
Fondop 2005	Cohort study
George 2007	Timed intercourse
Gerris 1995	Prospective non‐randomised study
Gerrits 2011	Trial to determine the safety of orally administered LH agonists
Ghanem 2011	Cohort study
Ghazizadeh 2009	Comparing the usefulness of GnRH antagonist administration in preventing premature LH surge
Ghosh Dastidar 2009	Comparing the supplementation of LH in the stimulation protocol
Int rhCG study group 2001	Included anovulatory patients only. Used both IUI and timed intercourse
Khattab 2005	Retrospective study design
Kossoy 1989	Cohort study
Kotecki 2005	Comparison of five different ovarian stimulation protocols
Lewis 2002	Abstract of an included study
Lewis 2003	Abstract of an included study
Martinez 1994	Retrospective study
Meherji 2004	Commentary report
Nulsen 1993	Cross‐over study. Comparing stimulated with non‐stimulated cycles. Comparing double versus single insemination
Odem 1991	Quasi‐randomised trial. Insemination through cervical cap
Panchal 2009	Cohort study
Papageorgiou 1995	Comparing stimulated with non‐stimulated cycles
Pierson 2002	Dose finding study
Pirard 2005	Investigated the luteal support between hCG triggered cycles and GnRHa administered cycles
Propst 2007	Cohort study. Not the comparison of interest
Propst 2012	Not comparison of interest
Ragni 1999	Compared a single peri‐ovulatory IUI with two double IUI regimes
Ramon 2009	Ultrasound guided IUI versus blind IUI
Ramon 2009a	Abstract of an excluded study
Robinson 1992	Inclusion of donor insemination only
Romeu 1997a	Prospective non‐randomised trial
Romeu 1997b	Failure to use a truly randomised design
Sakhel 2004	Abstract of an included study
Scarpellini 1991	Also comparing IUI with timed intercourse
Shanis 1995	Not truly randomised
Silverberg 1991	Comparing single versus double insemination
Tavaniotou 2003	Cohort study
Tonguc 2010	Inadequate randomisation; sequentially enrolled into three groups according to their entry
Wang 2001	Abstract of an excluded study
Wang 2006	Ovulation induction at different follicle sizes