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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.