Included studies		Date study author contacted	Date study author replied	Type of additional information	Type of additional data
Bartley 2008		11 December 2019	No reply
BEGIN Basal‐Bolus Type 1		15 January 2020	19 January 2020: Dr Heller replied that he would like to try to help with the request	Additional data	No reply with additional data
BEGIN Flex T1		21 January 2020	No reply
BEGIN Young		6 February 2020	No reply
Bolli 2009		11 December 2019	11 December 2019: would like to help, but did no longer have access to study data	Study protocol, 'Risk of bias' items, data on safety, additional data	Replied 13 December 2019: no additional data provided
Chase 2008		19 February 2020	No reply
Davies 2014		9 December 2019	30 December 2019: Novo Nordisk received the request from Dr. Davies and assured assistance	Study protocol, 'Risk of bias' items, data on safety, additional data	20 January 2020: Novo Nordisk provided additional data
Fulcher 2005		8 December 2019	Corresponding author was initially contacted. Due to lack of response, Sanofi was contacted on 29 January 2020 (replied same day that they would look further into the request)	Study protocol, 'Risk of bias' items, data on safety, additional data	31 January 2020: CSR was provided
Heller 2009		12 December 2019	Replied 19 January 2020 that he would try to help. As no further action, Novo Nordisk was contacted	Study protocol, 'Risk of bias' items, data on safety, additional data	Novo Nordisk provided CSR
Home 2005		12 December 2019	12 December 2019: would try to help, although data were old	Study protocol, 'Risk of bias' items, data on safety, additional data	Comments on data and suggestions
Kobayashi 2007		No contact information retrieved	21 March 2020: Novo Nordisk was contacted	Study protocol, 'Risk of bias' items, data on safety, additional data	26 May 2020: translated pages from CSRs provided
Liu 2016		17 February 2020	No reply from study authors. Sanofi was contacted 23/3‐20.	Asked for study protocol, 'Risk of bias' items and outcomes	26 March 2020: Sanofi provided CSR
NCT00595374		27 January 2020: Novo Nordisk was asked if the study was published	28 January 2020: Novo Nordisk replied they would look into the request	Asked for additional information	No CSR or additional information could be provided
NCT00605137		28 February 2020: Novo Nordisk was asked if the study was published	2 March 2020: Novo Nordisk replied they would look further into the request. Replied 9 March 2020 that CSR was only available in Japanese, but they were willing to provide some translated pages.	Asked for study protocol, 'Risk of bias' items and outcomes	24 May 2020: pages from CSR provided, study protocol provided
Pieber 2007		25 January 2020	No reply by the investigators, Novo Nordisk was contacted	Study protocol, 'Risk of bias' items, data on safety, additional data	Novo Nordisk provided CSR
Porcellati 2004		12 December 2019	11 December 2019: would like to help, but did no longer have access to study data	NA	NA
PRESCHOOL		19 February 2020	No reply from investigators. Sanofi was contacted.	'Risk of bias' items, outcomes	Sanofi provided CSR
Ratner 2000		13 January 2020: no reply 12 February 2020: Sanofi contacted	12 February 2020: Sanofi replied they were willing to assist	Study protocol, 'Risk of bias' items, data on safety, additional data	14 February 2020: Sanofi provided CSR
Robertson 2007		12 February 2020	12 February 2020: investigator did not have access to the data (retired). Novo Nordisk was contacted	'Risk of bias' items, additional data	12 February 2020: Novo Nordisk provided CSR
Russell‐Jones 2004		16 January 2020	19 January 2020: authors would like to help, but never replied. Novo Nordisk was contacted.	Study protocol, 'Risk of bias' items, data on safety, additional data	Novo Nordisk provided CSR
Schober 2002		17 February 2020	No reply from authors. Sanofi was contacted	'Risk of bias' items, additional data	Sanofi provided CSR
Standl 2004		28 November 2019: no reply; 29 January 2020: Novo Nordisk was contacted	No reply from investigator, Novo Nordisk was contacted	'Risk of bias' items, additional data	Novo Nordisk provided CSR
SWITCH 1		28 January 2020	1 February 2020: corresponding author replied that they would like to help. As investigator did not have access to data, Novo Nordisk was contacted	Data before cross‐over	24 March 2020: Novo Nordisk replied that the requested analyses for data before cross‐over were not performed
Thalange 2013		21 February 2020	No reply
Urakami 2017		12 February 2020	14 February 2020: corresponding author replied they would like to help	Study protocol, 'Risk of bias' items, data before cross‐over	No study protocol provided, but provided data on outcomes
Vague 2003		23 January 2020: no valid contact information available for the first author; Novo Nordisk was contacted	25 January 2020: Novo Nordisk replied that they would assist	Study protocol, 'Risk of bias' items, data on safety, additional data	Novo Nordisk provided CSR
Studies awaiting assessment	Study completion date	Date study author contacted	Date study author replied	Type of additional information	Type of additional data
Basal Analog Study	RT/CA	11 February 2020: asked for full‐text publication of study	11 February 2020: study never published. A new request if data could be provided.	11 February 2020: no additional data provided	NA
EudraCT 2007‐004144‐74	RT	11 February 2020: asked if full‐text publication was available and duration of the intervention	12/2‐20 ‐ investigator replied that no full‐text article was currently available, but might be in the future. No reply on duration of intervention	NA	NA
IRCT201203079224N1	RT	11 February 2020: asked for status of study	No reply
J‐Collection	RT	11 February 2020: asked for status of study	No reply
Mianowska 2007	PM	17 February 2020: asked for data before cross‐over	No reply
NCT00564018	RT	11 February 2020: asked for status of study	No reply
NCT01854723	RT	12 February 2020: investigator asked for full‐text publication or data on study	No reply
UMIN000001562	RT	12 February 2020: asked for study duration and full‐text	No reply
UMIN000020521	RT	11 February 2020: asked for status of study	No reply
UMIN000021046	RT	11 February 2020: asked for status of study	No reply
Excluded studies	Study completion date	Date study author contacted	Date study author replied	Date study author was asked for additional information (short summary)	Date study author provided data (short summary)
Orchard 2014	CA	11 February 2020: asked for full‐text publication of study	26 February 2020: investigator replied that no full‐text publication was planned. On the same day, the author was asked if additional information could be provided ‐ study protocol and power point presentation provided by the authors	Information about study design and data, publications of study	Based on information from investigator, the study could be excluded
—: denotes not reported CA: conference abstract; CSR: clinical study report; NA: not applicable; PM: published manuscript; RT: registered trial.