Table 1.
Repartition of malaria confirmation rate, incidence, parasites densities and relative risk by age group in Zindarou, July 2007 to December 2009
|
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 | - | - |
* RR: Risk of malaria by age group relative to risk of malaria in adults (≥15 years).
** p-values were calculated using the Z-score on RR. A p-value < 0.05 was considered significant.