Trial	Date trial author contacted	Date trial author replied	Date trial author was asked for additional information (short summary)	Date trial author provided data (short summary)
Atabek 2008	24 January 2014 15 May 2014	No	24 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details about the trial including funding, allocation concealment, randomisation method, dropout rates and adverse events	N/A
Berkowitz 2003	20 January 2014 15 May 2014	No	20 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details about the trial including randomisation method, allocation concealment and adverse events	N/A
Berkowitz 2006	20 January 2014 15 May 2014	No	20 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details on the trial's adverse events	N/A
Chanoine 2005	20 January 2014 25 March 2014 15 May 2014	20 January 2014 25 March 2014 15 May 2014 03/06/2014	20 January 2014 ‐ asked for additional unpublished data and other ongoing trials 25 March 2014 ‐ asked for raw BMI and SD values at 6 months' follow‐up 15 May 2014 ‐ asked for further details about the trial including blinding and adverse events	20 January 2014 ‐ author replied with confirmation the data of the trial was correct and attached an addition paper for the trial 25 March 2014 ‐ author provided the raw data at 6 months 15 May 2014 ‐ provided further details on blinding 3 June 2014 ‐ gave additional results on adverse events
Clarson 2009	24 January 2014 15 May 2014	31 January 2014 19 May 2014	24 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details about the trial including allocation concealment, blinding and adverse events	31 January 2014 ‐ author confirmed there was no further data for the trial and provided a protocol for an ongoing trial 19 May 2014 ‐ author provided further details about the trial
Franco 2014	24 February 2015	9 March 2015	24 February 2015	9 March 2015 ‐ authors replied with further details on the trial such as funding source, randomisation method and blinding
Freemark 2001	20 January 2014 25 March 2014 15 May 2014	16 May 2014	20 January 2014 ‐ asked for additional unpublished data and other ongoing trials 25 March 2014 ‐ asked for BMI raw data and associated SDs 15 May 2014 ‐ asked for further details about the trial including allocation concealment, blinding and adverse events	16 May 2014 ‐ author provided further details about the trial
Garcia‐Morales 2006	21 January 2014 15 May 2014	No	21 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details about the trial including the run‐in period, blinding and adverse events	N/A
Godoy‐Matos 2005	20 January 2014 15 April 2014	17 May 2014	20 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 April 2014 ‐ asked for further details about the trial including allocation concealment, randomisation method, blinding and adverse events	17 May 2014 ‐ author provided further details about the trial
Kendall 2013	24 January 2014 15 May 2014	29 January 2014	24 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details about the trial including blinding and adverse events	29 January 2014 ‐ author confirmed no additional data were available for the trial Author did not reply to the follow‐up email (15 May 2014)
Maahs 2006	20 January 2014 09 May 2014 15 May 2014	20 January 2014 09 May 2014 15 May 2014	20 January 2014 ‐ asked for additional unpublished data and other ongoing trials 09 May 2014 ‐ asked to confirmed if the data presented were SDs or SEs 15 May 2014 ‐ asked for further details on the trial's adverse events	20 January 2014 ‐ author confirmed no further data were available for the trial 09 May 2014 ‐ author confirmed the data were SDs 15 May 2014 ‐ author could not provide further information on the adverse events
Mauras 2012	24 January 2014 15 May 2014 16 May 2014	15 May 2014 27 May 2014	24 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details on the trial including allocation concealment, randomisation method, number of trial centres, blinding and adverse events 16 May 2014 ‐ asked for further information on adverse events	15 May 2014 ‐ author provided further details on the trial 27 May 2014 ‐ author said she would try to obtain the data; however, we received no further emails
NCT00001723	30 October 2015	30 October 2015	30 October 2015 ‐ asked for further details on the trial: blinding, allocation concealment, randomisation process, funding, publications and lifestyle programme	30 October 2015 ‐ author replied and gave further details
Ozkan 2004	No ‐ was unable to send emails to the address given in the publication	N/A	N/A	N/A
Prado 2012	17 January 2014 24 January 2014 15 May 2014	28 January 2014 18 May 2014	17 January 2014 ‐ asked for raw BMI data 24 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details on the trial including blinding, allocation concealment and adverse events	28 January 2014 ‐ author was unable to provide any unpublished data 18 May 2014 ‐ author provided further information about the trial
Rezvanian 2010	24 January 2014 15 May 2014	24 January 2014 15 May 2014	24 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details on the trial including allocation concealment and adverse events	24 January 2014 ‐ author confirmed there were no further details to give on the trial and provided references to other potentially relevant trials 15 May 2014 ‐ author provided further details about the trial
Srinivasan 2006	20 January 2014 15 May 2014	15 May 2014	20 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details on the trial including allocation concealment and adverse events	15 May 2014 ‐ author provided further details about the trial
Van Mil 2007	20 January 2014 15 May 2014	20 January 2014 30 May 2014	20 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details on the trial including randomisation, blinding and adverse events	20 January 2014 ‐ author confirmed findings were correct and highlighted the main finding of their trial 30 May 2014 ‐ author provided further details about the trial
Wiegand 2010	24 January 2014 15/04/2014	27 January 2014	24 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details on the trial including allocation concealment, randomisation, blinding and adverse events	27 January 2014 ‐ author confirmed there was no further data available for the trial Author did not reply to the follow‐up email
Wilson 2010	24 January 2014 15 May 2014	24 January 2014 15 May 2014	24 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details on the trial including dropouts and adverse events	24 January 2014 ‐ author confirmed there was no unpublished data on the main outcomes of the trial 15 May 2014 ‐ author said he would try to obtain the data; however, I did not receive any further emails
Yanovski 2011	24 January 2014 15 May 2014	24 January 2014	24 January 2014 ‐ asked for additional unpublished data and other ongoing trials 15 May 2014 ‐ asked for further details on the trial's adverse events	24 January 2014 ‐ author confirmed the trial was over and there is no further information available Author did not reply to the follow‐up email
BMI: body mass index; N/A: not applicable; SD: standard deviation; SE: standard error.