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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.