Table 1

AMSTAR ratings for each systematic review

Review	Q1 A priori design provided	Q2 Duplicate study selection and data extraction	Q3 Comprehensive literature search	Q4 Publication status as inclusion criterion	Q5 List of studies (included and excluded) provided	Q6 Characteristics of included studies provided	Q7 Quality assessment	Q8 Quality used appropriate	Q9 Methods used to combine appropriate	Q10 Publication bias assessed	Q11 Conflict of interest stated	Total
Oral supplementation with vitamins alone or in combination with other micronutrients
McCauley et al 24	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No	Yes	9
Rumbold et al 45	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
Rumbold et al 46 46	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
De-Regil et al25	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
Lassi et al 26	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
Oral supplementation of minerals alone or in combination with other micronutrients
An et al 27	No	Yes	Yes	Cannot answer	Yes	Yes	Yes	No	Yes	No	Yes	7
Buppasiri et al28	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
Hofmeyr et al 29	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
Peña-Rosas et al 30	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
Harding et al 31	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	11
Makrides et al 32	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
Ota et al 33	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
Soltani et al 34	No	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No	No	7
Multiple micronutrients supplementation
Fall et al 35	No	Cannot answer	No	No	No	Yes	No	No	Yes	No	Yes	3
Haider et al 36	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
Ramakrishnan et al 37	No	No	Yes	Yes	No	Yes	No	No	Yes	Yes	Yes	6
Protein supplementation and nutritional education
Ota et al38 38	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	11
Marine oil and fatty acids supplementation
Makrides et al39	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No	Yes	9
Salvig et al40	No	Yes	No	Cannot answer	Yes	Yes	Yes	No	No	No	Yes	5
Reduced salt intake
Duley et al41	Yes	Yes	No	Cannot answer	Yes	Yes	Yes	No	Yes	No	Yes	7
Soil-transmitted helminthiasis preventive chemotherapy
Salam et al42	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	10
Preventive antimalarial drugs
Radeva-Petrova et al43	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No	Yes	9
Muanda et al 44	No	Yes	Yes	No	No	Yes	Yes	No	Yes	Yes	Yes	7