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Table 2 Age and sex distribution of the examined population during the baseline survey in 1987 and the evaluation survey in 2008.

From: Impact of long-term treatment of onchocerciasis with ivermectin in Kaduna State, Nigeria: first evidence of the potential for elimination in the operational area of the African Programme for Onchocerciasis Control

Survey   Age in years Sex Total
   1-9 10-19 20-29 30-49 50+ Male Female N
Pre-treatment (1987) No. examined 1,388 1,419 1,100 1,444 675 2,988 3,038 6,026
  % 23.0 23.5 18.3 24.0 11.2 49.6 50.4 100
Evaluation (2008) No. examined 1,156 808 433 803 503 1,779 1,924 3,703
  % 31.2 21.8 11.7 21.7 13.6 48.0 52.0 100