Study ID	References to other relevant studies	Correspondence required (yes or no, and why)	Further study information requested	Correspondence received (from whom, what, when)	Information used in review
Neufeld 2013	—	Abstract, requested full text	MV emailed author on 10 April 2018	Received email from Lynnette Neufeld <lneufeld@gainhealth.org> on 12 April 2018, who provided 2 full texts.	Screened 2 full texts provided
Shamah‐Levy 2015	—	Abstract, requested full text	MV emailed author on 10 April 2018	Received email from Elsa Berenice Gaona Pineda <berenicegp.insp@gmail.com> on 10 April 2018 with full text	Screened 1 full text provided
Wood	—	Abstract, requested full text	MRC library requested dissertation requested on 12 April 2018	No response	None
Kusuma 2016	—	Method of randomisation of village clusters not clear, data from nutrition and food security intervention comparisons required, treatment regimen of control group unclear	AS emailed author about outcomes on 6 February 2018 (follow‐up on 13 February 2018 and 13 March 2018). Authors only nutrition outcomes is whether mothers took supplements therefore review excluded on the basis of no relevant outcomes	No response from dkusuma@mail.harvard.edu	None
Murshed E Jahan 2011	—	Baseline data	MV emailed author on 22 March 2018	No response from 'k.jahan@cgiar.org'; d.pemsl@cgiar.org	None
Skoufias 2013	—	Additional outcome data, requested study report	MV emailed author on 8 June 2018	Received email from Emmanuel skoufias <eskoufias@worldbank.org on 8 June 2018	Need to screen 1 full text in Spanish
Asadullah 2015	—	nrs LTFU unclear and nrs of participants do not match between tables in paper; unclear units of measurement and measure of central tendency; data duplicated for two outcomes	SD emailed author Mohammad N. Asadullah about nrs LTFU and participant numbers on 31 July 18; AB emailed author on two additional email addresses on 7 February 2019 to follow‐up SD queries and additional issues identified in outcome extraction. AB followed up on 18 February 19.	Author responded on 6 March 19 from m.niaz@um.edu.my and endeavoured to provide further information	None yet
Asfaw 2014	—	Mean monthly food consumption expenditure exceeds mean total monthly household consumption expenditure (defined as including all household expenses)	AB emailed author Patrick Ward on 28 January 19 to determine whether mean household food consumption expenditure is not included in mean total monthly household expenditure and, if not the case, why this sub‐category exceeds the category total. AB followed up on 18 February 19.	Author responded on 19 February 19 from patrick.ward@opml.co.uk and endeavoured to provide further information, requested from Aly Visram (co‐author; aly.visram@opml.co.uk) on 28 February 2019	None yet
Weinhardt 2017	—	yes. Information re clarification of outcome malnutrition in paper and what it means exactly	SD emailed Weinhardt and Alice Yan about clarification of table 3 malnutrition outcome and whether there are separate results for stunting and wasting	No response	—
Darrouzet‐Nardi 2016	—	yes. Information re correct data for HAZ in table 4 of Miller 2014	SD emailed both Darrouzet‐Nardi and Miller on 25 September 2019 re this issue	No response	—
Seidenfeld 2013	Daidone 2014	yes. Effect measure and narrative description of result on food security scale discrepant.	SD emailed 14 October 2019	Response on 18 December 2019, responding to query.	Correct effect direction confirmed and used in the review
Nkonya 2019	—	Yes.	AB emailed 1 April 2020 to clarify study design eligibility.	Yes	Study excluded
Hidrobo 2014	—	Yes	MV emailed 29 April 2020. Request for number of participants analysed per group	No response	—
Osei 2017	—	Yes	MV emailed 30 April 2020. Request for number of participants analysed per group	No response	—
Beegle 2017	—	Yes	MV emailed 30 April 2020. Request for number of participants analysed per group	Yes. Provided required information.	Enabled meta‐analysis to be carried out