Considering the hematological changes
during pregnancy and the fact that groups
were not homogeneous in terms of the
“gestational age in the beginning of prenatal
care” variable (Table 1), the frequency of
anemia and hemoglobin levels stratified
by gestational trimester were analyzed.
The results confirmed the increase in the
occurrence of anemia with the advance
in the gestational period, as observed in
several studies, where the prevalences of
anemia varied from 3.6% to 23.9% in the first trimester; from 9.2% to 43.9% in the
second trimester; and from 10.9% to 52.3%
in the third trimester