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Table 2 Observed and true Rift Valley fever animal prevalence, associated exact 95% Confidence interval for two-stage cluster sampling and within sampling site prevalence by region

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

Region Positive animals/No sampled Observed [true] prevalence* (%) 95% Confidence interval (%) Within site prevalence range (%)
Wilayas 4/356 0.92 [0.95] 0.25 – 3.38 0 – 2.47
Bir Lehlou 1/90 0.69 [0.70] 0.09 – 4.83 0 – 1.14
Tifariti 4/89 4.96 [5.29] 1.88 – 12.44 0 – 7.69
Mehaires 1/84 1.22 [1.27] 0.17 – 8.21 0 – 7.14
Mijek 0/81 0 [0] 0 – 0 0 – 0
Agwanit 0/94 0 [0] 0 – 0 0 – 0
Dougaj 0/85 0 [0] 0 – 0 0 – 0
Dahkla 1/103 1.75 [1.84] 0.24 – 11.48 0 – 1.75
TOT 11/982 0.97 [1.00] 0.33 – 2.85 0 – 7.69
  1. *Adjusted Wald test between region (d.f. 7, 974) (p = 0.0001).