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Table 1 Repartition of confirmed episodes of malaria by age and age-related risk of malaria in Makokou area in 2009, 2011 and 2012

From: No evidence of decline in malaria burden from 2006 to 2013 in a rural Province of Gabon: implications for public health policy

Years Age group (years) Population size estimate by age group* No. of confirmed malaria cases Percent by age group Annual incidence estimate ( 0/00) RR (95% CI)** pvalue***
2009 0-4 3860 1158 48.7 300.00 7.5 (2.7-20.5) < 0.0001
5-14 6176 391 16.4 63.31 1.5 (0.4-5.2) 0.519
15-50 12351 679 28.6 54.98 1.2 (0.3-4.5) 0.733
> 50 3345 150 6.3 44.84 Ref -
2010 0-4 3981 1387 52.5 348.44 7.0 (2.8-17.1) < 0.0001
5-14 6369 491 18.6 77.09 1.6 (0.5-4.7) 0.394
15-50 12738 595 22.5 46.71 1.0 (0.3-3.3) 1
> 50 3450 169 6.4 48.99 Ref -
2011 0-4 4105 1751 55.4 426.53 8.6 (3.6-20.8) < 0.0001
5-14 6568 569 18 86.63 1.8 (0.6-5.2) 0.27
15-50 13137 656 20.7 49.94 1.0 (0.3-3.3) 1
> 50 3558 187 5.9 52.56 Ref -
2009-2011 0-4 3982 4296 52.5 359.63 7.2 (2.9-17.6) < 0.0001
5-14 6371 1451 17.7 75.92 1.6 (0.5-4.7) 0.394
15-50 12742 1930 23.6 50.49 1.0 (0.3-3.3) 1
> 50 3451 506 6.2 48.88 Ref -
  1. *RR: Risk of malaria by age group relative to risk of malaria in adults (>50 years).
  2. **p-values were calculated using the Z-score and RR. A p-value <0.05 was considered significant.
  3. ***Population denominators for the various age groups used to estimate the age-related risk of malaria in the Ogooué-Invendo were deduced from the age-structure of the Gabon population (http://populationpyramid.net/fr/gabon/). The 2010 pyramid population shows that young children between 0–4 years represented 14.6%, and that higher proportions 24%, 47.2 and 13.2%, respectively, were found in age groups 5–14, 15–50 and >50.
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