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Table 1 Distribution of Nigeria population based on projections based on 1991 census.

From: The Nigerian national blindness and visual impairment survey: Rationale, objectives and detailed methodology

Geo political zone

Total population

% of total in each Geo Political Zone

Estimated population = > 40 years

% = > 40 years

Sample size = > 40 years

North Central

18,312, 959

13.7

2,981,514

13.2

2,027

North East

22,211, 520

16.6

3,806,234

16.8

2,588

North West

30,120,187

22.5

5,147,360

22.8

3,499

South East

16,194,215

12.1

2,620,756

11.6

1,782

South South

20,221, 525

15.0

3,290,629

14.6

2,237

South West

26,237,689

19.6

4,657,051

20.6

3,166

Abuja Federal Capital Territory

558,829

0.4

112,335

0.5

76

Total

133,856,924

100.00

22,615,879

100

15375