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Table 3 Observed and true Rift Valley fever animal prevalence, associated exact 95% Confidence interval for two-stage cluster sampling and within specie prevalence by sampling site

From: Evidence of rift valley fever seroprevalence in the Sahrawi semi-nomadic pastoralist system, Western Sahara

Site Location Positive animals/ No sampled Observed [true] prevalence* (%) 95% Confidence interval (%) Within-species prevalence range (%)
1 27 Febrero 2/87 2.47 [2.61] 0.62 – 9.38 0 – 4.88
2 Smara 2/92 2.35 [2.49] 0.59 – 8.95  
3 Awserd 0/86 0 [0] 0 – 0 0 – 0
4 El Aaiun 0/91 0 [0] 0 – 0 0 – 0
5 Bir Lehlou 1/60 1.14 [1.19] 0.16 – 7.79 0 – 2.27
6 Bir Lehlou 0/6 0 [0] 0 – 0 0 – 0
7 Bir Lehlou 0/10 0 [0] 0 – 0 0 – 0
8 Bir Lehlou 0/14 0 [0] 0 – 0 0 – 0
9 Tifariti 0/23 0 [0] 0 – 0 0 – 0
10 Tifariti 4/61 7.69 [8.22] 2.91 – 18.80 0 – 15.38
11 Tifariti 0/5 0 [0] 0 – 0 0 – 0
12 Mehaires 0/17 0 [0] 0 – 0 0 – 0
13 Mehaires 0/21 0 [0] 0 – 0 0 – 0
14 Mehaires 0/15 0 [0] 0 – 0 0 – 0
15 Mehaires 1/20 7.14 [7.63] 1.00 – 36.95 0 – 14.29
16 Mehaires 0/11 0 [0] 0 – 0 0 – 0
17 Mijek 0/15 0 [0] 0 – 0 0 – 0
18 Mijek 0/66 0 [0] 0 – 0 0 – 0
19 Agwanit 0/38 0 [0] 0 – 0 0 – 0
20 Agwanit 0/56 0 [0] 0 – 0 0 – 0
21 Dougaj 0/42 0 [0] 0 – 0 0 – 0
22 Dougaj 0/43 0 [0] 0 – 0 0 – 0
23 Dahkla 1/103 1.75 [1.84] 0.24 – 11.48 0 – 5.26
TOT   11/982 0.97 [1.00] 0.33 – 2.85 0 – 15.38
  1. *Adjusted Wald test between sampling sites (d.f. 22, 974) (p = 0.0001).