Information is Beautiful recently won a competition on Wired US magazine to revisualize a bloodwork test. This particularly appealed to me as my recent anaemia was recently presented to me as the number 8.4. Data without context isn’t particularly helpful (see the original image of the results):
The context for my blood results was that the normal range of haemoglobin was 12mg to 15mg and mine was 8.4mg.
Now see the following image for how the appropriate data visualisation could make such numbers immediately understandable:
See Information in Beautiful for further details http://www.informationisbeautiful.net/2010/visualizing-bloodtests/