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Table 1 Repartition of malaria confirmation rate, incidence, parasites densities and relative risk by age group in Zindarou, July 2007 to December 2009

From: Epidemiology of malaria in an area of seasonal transmission in Niger and implications for the design of a seasonal malaria chemoprevention strategy

Age group

Population

Number of

Number of positive

Asexual parasite density

Annual

RR

p-

(at t = 0)

size

presumptive cases

slides (%)

(p/μl) [CI95%]

incidence (°/°°)

[CI95%]*

value**

<2 years

31

60

34 (56.7)

18, 664 [8, 074–26, 738]

439

2.88 [2.45-3.39]

<0.00012

2-4 years

64

171

97 (56.7)

19, 084 [12, 847–2,5 320]

606

3.98 [3.42-4.65]

<0.0001

5-9 years

62

106

41 (38.7)

5, 312 [1, 641–8, 984]

265

1.74 [1.46-2.09]

<0.0001

10-14 years

58

85

22 (25.9)

4, 027 [1, 136–6, 918]

152

1.0 [0.81-1.23]

0.96

≥15 years

226

543

86 (15.8)

7, 846 [2, 804–12, 888]

152

1.0

-

Total

441

965

280 (29.0)

12, 358 [9, 390–15, 326]

254

-

-

  1. * RR: Risk of malaria by age group relative to risk of malaria in adults (≥15 years).
  2. ** p-values were calculated using the Z-score on RR. A p-value < 0.05 was considered significant.