The Effects of Two Maternal Vitamin A Supplementation Regimens on Serum Retinol in Postpartum Mothers: A Randomised Controlled Trial in Brazil

Table 3

Serum retinol concentration in Brazilian mothers enrolled in a postpartum supplementation trial. Recife, Brazil—2007–2009.

Group	Time postpartum
	Baseline	2 months	4 months	6 months
	mean ± SD (𝑛)	mean ± SD (𝑛)	mean ± SD (𝑛)	mean ± SD (𝑛)
	(𝜇mol/L)	(𝜇mol/L)	(𝜇mol/L)	(𝜇mol/L)
400,000 IU vitamin A	1.62 ± 0.74 (114)	2.04 ± 0.67 (119)	2.10 ± 0.71 (103)	2.14 ± 0.57 (95)
200,000 IU vitamin A	1.60 ± 0.69 (115)	1.96 ± 0.63 (117)	2.22 ± 0.55 (110)	2.22 ± 0.55 (105)

SD: Standard deviation. Linear regression model with GEE methods, interaction between treatment groups (𝑃=0.253).