Table 1 |
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Summary of Somalia survey data by source for the North and South zones. |
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Survey source |
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|
Zone |
FAO/FSAU n (%) |
WHO n (%) |
Total n (%) |
|
|
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|
North |
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|
Number survey locations sampling with 40+ people |
64 |
61 |
125 |
|
Number geo-referenced |
55 (85.9%) |
60 (98.4%) |
115 (92.0%) |
|
Number identified as outliers |
0 (0.0%) |
2 (3.3%) |
2 (1.6%) |
|
Number selected for model* |
55 (85.9%) |
58 (95.1%) |
113 (90.4%) |
|
Number of surveys with zero PfPR** |
32 (50.0%) |
26 (42.6%) |
58 (46.4%) |
|
Population sample size |
5,213 |
5,255 |
10,468 |
|
Number PfPR positive |
97 |
196 |
293 |
|
Mean (Median) PfPR (%) |
1.8 (0.0) |
3.7 (1.1) |
2.8 (0.0) |
|
IQR PfPR (%) |
(0.0, 3.1) |
(0.0, 4.0) |
(0.0, 4.0) |
|
South |
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|
Number survey locations sampling 40+ people |
311 |
64 |
375 |
|
Number geo-referenced |
279 (89.7%) |
58 (90.6%) |
337 (89.9%) |
|
Number identified as outliers |
1 (0.3%) |
0 (0.0%) |
1 (0.3%) |
|
Number selected for model* |
278 (89.4%) |
58 (90.6%) |
336 (89.6%) |
|
Number of surveys with zero PfPR** |
73 (23.5%) |
23 (35.9%) |
96 (25.6%) |
|
Population sample size |
16,048 |
3,963 |
20,011 |
|
Number PfPR positive |
2,081 |
208 |
2,289 |
|
Mean (Median) PfPR (%) |
13.0 (4.0) |
5.2 (2.0) |
11.4 (3.0) |
|
IQR PfPR (%) |
(0.0,10.0) |
(0.0, 6.0) |
(0.0, 9.0) |
|
|
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*Sample size, number positive and the mean, median and IQR of PfPR include those surveys reporting zero number positive for PfPR. **At the margins of stable malaria transmission, zero P. falciparum parasites in a sample is not necessarily an indication of true absence of parasites but could also be due to low sample sizes or test equipment with low sensitivity [33]. Given this difficulty in distinguishing true zero from sample zero at low PfPR, surveys reporting zero prevalence were included in the analysis. IQR = interquartile range; PfPR = Plasmodium falciparum parasite rate; FAO/FSAU = Food and Agricultural Organization – Food Security Analysis Unit; WHO = World Health Organization. |
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Noor et al. Malaria Journal 2008 7:159 doi:10.1186/1475-2875-7-159 |
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