Seminar
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Vol 379 January 14, 2012
167
disease from 1999 to 2006 were about 11·5% (4·8% in
stages 1–2 and 6·7% in stages 3–5), and 47% in people
older than 70 years, mostly because of reduced GFR.
29
Prevalence seems to be increasing
particularly in older
individuals, and partly because of an increasing
prevalence of diabetes and hypertension.
30
Reports from
other countries
8
show some
variation but are mostly
consistent with these results.
In the USA, the ratios of prevalence of chronic kidney
disease to incidence and prevalence of treated kidney
Duration >3 months on the basis of documentation
or inference
Duration is necessary to distinguish chronic from acute
kidney
disease
• Clinical assessment can indicate duration
• Documentation of duration is not usually available in
epidemiological
studies
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