Table 2

Changes in blood lead concentrations and iron parameters after iron supplementation

Serum iron (μg/dl)Serum ferritin (μg/l)Blood lead (μg/dl)
Data were expressed as mean (SD).
*Anaemic subjects were supplemented with ferrous sulphate for one month.
†Stage II children with no iron treatment were checked one month after initiation of this study.
‡p<0.01 versus stage III children before supplementation, computed by Wilcoxon signed rank test.
§p<0.01 versus stage II children without supplementation for one month, computed by Mann-Whitney U test.
¶Not significant versus initial values of stage II children, computed by Wilcoxon signed rank test.
**p<0.01 versus mean changes of stage III children, computed by Mann-Whitney U test.
Stage III children (n=34)*
    Before supplementation20.6 (10.5)8.2 (3.4)6.8 (1.7)
    After supplementation for one month64.8 (16.2)‡§33.6 (15.8)‡§2.7 (1.2)‡§
    Mean changes44.1 (13.6)25.4 (12.7)−4.1 (1.5)
Stage II children (n=12)†
    Initial values31.3 (6.8)8.7 (3.6)6.3 (1.2)
    Without supplementation for one month32.7 (7.1)¶9.1 (3.2)¶6.5 (1.4)¶
    Mean changes1.4 (3.2)**0.4 (1.7)**0.2 (1.3)**