Outcome or subgroup	Studies	Participants	Statistical method	Effect estimate
1.1 Anaemia	1		Risk Ratio (IV, Random, 95% CI)	No totals
1.1.1 Iron Supplementation with or without Folic Acid	1		Risk Ratio (IV, Random, 95% CI)	No totals
1.2 BMI	6		Mean Difference (IV, Random, 95% CI)	Subtotals only
1.2.1 Calcium/Vitamin D Supplementation/Fortification	2	964	Mean Difference (IV, Random, 95% CI)	−0.01 [−1.20, 1.17]
1.2.2 Iron Supplementation with or without Folic Acid	2	738	Mean Difference (IV, Random, 95% CI)	0.47 [−0.17, 1.11]
1.2.3 Zinc Supplementation	1	382	Mean Difference (IV, Random, 95% CI)	0.35 [−0.15, 0.85]
1.2.4 Multiple Micronutrient Fortification	2	943	Mean Difference (IV, Random, 95% CI)	0.23 [−0.11, 0.57]
1.3 Haemoglobin	6		Mean Difference (IV, Random, 95% CI)	Subtotals only
1.3.1 Iron Supplementation with or without Folic Acid	4	1,220	Mean Difference (IV, Random, 95% CI)	0.58 [0.28, 0.88]
1.3.2 Multiple Micronutrient Fortification	2	1,102	Mean Difference (IV, Random, 95% CI)	−0.10 [−0.88, 0.68]
1.4 Micronutrient status: Serum 25(OH) D	2	517	Std. Mean Difference (IV, Random, 95% CI)	2.85 [0.89, 4.82]
1.4.1 Calcium/Vitamin D Supplementation/Fortification	2	517	Std. Mean Difference (IV, Random, 95% CI)	2.85 [0.89, 4.82]
1.5 Micronutrient status: Serum zinc levels	2	494	Std. Mean Difference (IV, Random, 95% CI)	6.94 [−4.84, 18.71]
1.5.1 Zinc Supplementation	2	494	Std. Mean Difference (IV, Random, 95% CI)	6.94 [−4.84, 18.71]
1.6 Body composition: Total body BMC	1		Mean Difference (IV, Random, 95% CI)	No totals
1.6.1 Calcium/Vitamin D Supplementation/Fortification	1		Mean Difference (IV, Random, 95% CI)	No totals
1.7 Body composition: Total body BMD	1		Mean Difference (IV, Random, 95% CI)	No totals
1.7.1 Calcium/Vitamin D Supplementation/Fortification	1		Mean Difference (IV, Random, 95% CI)	No totals
1.8 Cognitive outcomes	1		Mean Difference (IV, Random, 95% CI)	No totals
1.8.1 Digit span scores	1		Mean Difference (IV, Random, 95% CI)	No totals
1.8.2 Clerical task scores	1		Mean Difference (IV, Random, 95% CI)	No totals
1.8.3 Visual memory test scores	1		Mean Difference (IV, Random, 95% CI)	No totals
1.8.4 Maze test scores	1		Mean Difference (IV, Random, 95% CI)	No totals