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Mean concentration of haemoglobin in healthy white participants as a
function of: (a) age, stratified as 26-35, 36-45, 46-55, 56-65, 66-75, and 76-99 years, plotted at the interval midpoint, number
of participants shown; (b) per cent transferrin saturation
in 26-55 year olds; (c) serum ferritin concentration in
26-55 year olds; and (d) per cent transferrin saturation in
>55 year olds, divided into tenths and plotted at the mean for each
tenth. Error bars show the standard error in the mean. Group sizes are
given on bmj.com