Table 2.
Means, medians, and quartile distributions of serum IGF-1 concentrations (ng/mL) among preschool children with Down syndrome, according to vitamin A deficiency. Ribeirão Preto 2009-2011. Brazil.
| Mean (SD) | p-valuea | Minimum | 1st quartile | Median | 3rd quartile | Maximum | |
|---|---|---|---|---|---|---|---|
| Without VAD (n = 35) | 116.3 (92.2) | 0.780 | 25.0 | 40.4 | 102.0 | 170.0 | 440.0 |
| VAD (n = 12) | 103.5 (54.9) | 35.0 | 65.6 | 99.0 | 112.5 | 238.0 |
SD, standard deviation; VAD, vitamin A deficiency.
a
significance of the effect of VAD obtained from multiple linear regression, with log transformation for serum IGF-1 and adjustment for age, sex and for serum retinol concentrations before supplementation.