3. Participant socioeconomic status.

Study ID	Intervention group	Control group
Birungi 2015	Socioeconomically disadvantaged women and their infants/children; 64.7% and 35.3% of participants followed up for 5‐year outcomes reported by authors to be "poor" and "less poor", respectively.
Chaffee 2013	Social class by ABIPEME index (includes material possessions and education, A highest, E lowest status), n (%): A1: 0 (0) A2: 0 (0) B1: 8 (3.4) B2: 46 (19.5) C: 137 (58.1) D: 40 (17.0) E: 5 (2.1)	Social class by ABIPEME index (includes material possessions and education, A highest, E lowest status), n (%): A1: 0 (0) A2: 0 (0) B1: 7 (3.2) B2: 38 (17.2) C: 136 (61.1) D: 39 (17.2) E: 2 (0.9)
Dasanayake 1993	Not reported
Dasanayake 2002	Not reported
Feldens 2007	Quote: "The income was low for most of the families". Household income below one minimum wage of the national salary: 10.7% Household income between 1 and 3 minimum wages: 63.5%	Quote: "The income was low for most of the families". Household income below one minimum wage of the national salary: 11. 1% Household income between 1 and 3 minimum wages: 58.7%
Hallas 2015	Socioeconomically disadvantaged women and their infants/children
Harrison 2012	Socioeconomically disadvantaged women and their infants/children
Kramer 2001	Not reported
Lapinleimu 1995	Not reported
Muhoozi 2017	Socioeconomically disadvantaged women and their infants/children; about 84.4%, 83.8% and 76.4% of the households in the intervention group suffered mild to severe household food insecurity at baseline, at 12 to 16 months, and at 20 to 24 months, respectively. Maternal education: mean 4.9, SD 2.8 yrs	Socioeconomically disadvantaged women and infants/children; about 85.9%, 89.3%, and 80.0% of the households in the control group suffered mild to severe household food insecurity at baseline, at 12 to 16 months, and at 20 to 24 months, respectively. Maternal education: mean 4.9, SD 2.8 yrs
Plutzer 2008	Mixed socioeconomic status Quote: participant "residences were distributed over 151 postcodes across Adelaide and its suburbs"; no further details provided.
Robertson 2013	Socioeconomically disadvantaged women and their infants/children
Soderling 2000	Not reported
Thorild 2003	Not reported
Veronneau 2010	Not reported
Watt 2009	Quote: "Overall, the sample was relatively disadvantaged with 28% being lone parents, 57% living in social housing and 33% receiving income support/job seekers allowance".
Zanata 2003	Socioeconomically disadvantaged

^{ABIPEME index: Associação Brasileira dos Institutos de Pesquisa de Mercado fundada em ‐ the Brazilian Association of Market Survey Institutes categorization of Brazilian socioeconomic class; SD: standard deviation; yrs: years}