Prevalence of health issues by age group.

*Low and high defined by reference range for age/gender. Although a proportion of the population may have results outside a reference range if it is defined according to a normal distribution; and reference ranges will not be specific to this group; in practice, most results outside the reported reference range require at least clinical assessment, and may require treatment, hence the results are reported using the reference ranges of the pathology provider.†Defined by titre ≥1: 32.‡Faecal pathogens were any one of Giardia intestinalis, Entamoeba histolytica/dispar, Cyclospora cayetanensis, Hookworm, Trichuris trichiuria, Taenia spp, Strongyloides stercoralis, Enterobius vermicularis, Ascaris lumbricoides.ŞDefined by being Hepatitis B cAb positive where sAb was detected.