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Table 5 The top 20 priority countries in terms of spatially referenced population data needs

From: The effects of spatial population dataset choice on estimates of population at risk of disease

Rank Country PPU Population data year
1 Iraq 1,258,000 1985
2 Congo, Democratic Republic of the 347,000 1984
3 Chad 527,000 1990
4 Syria 1,241,000 1994
5 Libya 223,000 1984
6 Cameroon 255,000 1987
7 Sudan 358,000 1993
8 Papua New Guinea 241,000 1990
9 United Arab Emirates 399,000 1995
10 Nigeria 231,000 1991
11 Togo 216,000 1991
12 Pakistan 1,309,000 1998
13 Egypt 281,000 1996
14 Iran 260,000 1996
15 Bhutan 110,000 1985
16 Algeria 634,000 1998
17 Guinea 257,000 1996
18 Uzbekistan 118,000 1989
19 Eritrea 94,000 1984
20 Senegal 107,000 1985
  1. The ranks are based on ranking all country data in the GPW/GRUMP database (http://sedac.ciesin.columbia.edu/gpw/spreadsheets/GPW3_GRUMP_SummaryInformation_Oct05prod.xls) by population per unit (PPU) and date of the input population count data, then summing these to create a simple combined rank score. Additional file 1, Table S4 shows the top 50 countries.