Date	Event	Description
15 October 2014	New search has been performed	One new co‐author was added for the update of this review (Cristiane R Macedo). Three new trials were added.
15 October 2014	New citation required and conclusions have changed	With the addition of three new studies (Kjotrod 2011; Palomba 2011; Qublan 2009), totalling 816 participants, the conclusions of the review have changed.
1 November 2012	New search has been performed	The search was updated on 5 November 2012. Three new trials were included (Kjotrod 2011; Palomba 2011; Qublan 2009) totalling 801 participants. The conclusions of the review changed: the clinical pregnancy rate was significantly higher in the metformin group. Two new co‐authors were added (Luiz Eduardo T Albuquerque and Cristiane R Macedo).
31 August 2008	Amended	The 'Risk of bias' table was completed.
13 April 2008	Amended	The review was converted to the new format.
28 February 2008	New citation required and conclusions have changed	Substantive amendment.