Zinc in different periods of pregnancy. A study on pregnant women of high and low socio-economic levels

We have measured zinc in the serum of pregnant and non-pregnant women classified in two socio economic levels, high socioeconomic level pregnant and non-pregnant women attending a private office and low socio-economic level pregnant and nonpregnant women either attending our hospital, belonging to a social welfare or not. The samples in the pregnant women were collected in the first, second and third trimesters of pregnancy. The socio-economic condition was proved to be important when comparing both groups of pregnant women. Such differences had already been remarked in the non-pregnant women group where the serum concentration was statistically greater at a higher socioeconomic condition. Also both groups had different behaviours during the pregnancy. The women having a high socio-economic condition did not present any remarkable difference during the pregnancy whereas the low socio-economic condition ones, showed in the third trimester, zinc levels significantly lower than in the second trimester of pregnancy.