Fig. 6

Distribution of anaemia among different infection groups and intensity. The prevalence of anaemia was stratified by infection status (A) and by the infection intensity of malaria (B) and S. mansoni (C). The infection intensity of malaria parasite load was classified as light infection (1–499 parasites/μl of blood), moderate infection (500–1999 parasites/μl of blood) and heavy infection (≥ 2000 parasites/μl of blood). The infection intensity of S. mansoni was classified as light infection (1–99 eggs/gram), moderate infection (100–399 eggs/gram) and heavy infection (≥ 400 eggs/gram). The bar chart represents the percentage (%) prevalence with 95% confidence intervals (i.e., error bars). The dark (black) bars normal haemoglobin (Hb) levels (Hb ≥ 11.0 g/dl) and the light bars represent the anaemic group (Hb > 7.0 and < 11 g/dl)