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
| 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 |
*Adjusted Wald test between sampling sites (d.f. 22, 974) (p = 0.0001).