Comparison 1. β‐carotene supplementation versus placebo.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1.1 Growth and nutritional status: z score for height	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.1.1 At 6 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.2 Respiratory outcomes: FEV1 (% predicted)	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.2.1 At 3 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.2.2 At 6 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.3 Respiratory outcomes: antibiotic days per patient in past 3 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.3.1 At 3 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.3.2 At 6 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.4 Plasma concentrations: vitamin A [µmol/L]	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.4.1 At 3 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.4.2 At 6 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.5 Plasma concentrations: β‐carotene [µmol/L]	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.5.1 At 3 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected
1.5.2 At 6 months	1		Mean Difference (IV, Fixed, 95% CI)	Totals not selected