Age of data
The table below gives the average age of the latest internationally
available data for three key indicators: the under-5 mortality rate, the
net enrolment rate (proportion of children of primary school age who are
enrolled in primary school) and the percentage of under-5s who are underweight.
The more up-to-date statistics used by most governments and international
organizations are often interpolated and/or extrapolated from past surveys.The
table shows the number of years that have elapsed, on average, between
the last national on-the-ground surveys and the year 1996.
In some cases, governments may have more recent statistics that have
not yet been made available to the United Nations.
A small number of countries have no known data at all for certain indicators.
Published data for such countries usually represent estimates based on
neighbouring countries at similar levels of GNP per capita.