Table 2. Explanatory variables included in the analysis of C. burnetii infection (71 farms, Reunion Island, 2011–2012).
| Variables | % of farms | % of positive farms | Animal seroprevalence | P-value | |
| Renewal of ruminants population | No | 16,22 | 33,33 | 0,293 | - |
| Yes | 72,97 | 48,15 | 0,253 | 0.103 | |
| Proximity to another farm | No | 17,57 | 46,15 | 0,245 | - |
| Yes | 71,62 | 32,88 | 0,273 | 0.089 | |
| Exposure to dominant winds | No | 44,59 | 42,42 | 0,238 | - |
| Yes | 55,41 | 39,02 | 0,253 | 0.08 | |
| Animal grazing | No | 29,73 | 18,18 | 0,215 | - |
| Yes | 70,27 | 48,15 | 0,253 | 0.068 | |
| Treatment against ectoparasites | No | 31,08 | 21,74 | 0,182 | - |
| Yes | 68,92 | 49,02 | 0,253 | 0.016 | |
| Animals kept in the farm at night | No | 48,65 | 44,44 | 0,273 | - |
| Yes | 51,35 | 36,84 | 0,241 | 0.109 | |
| Environmental control | No | 36,49 | 22,22 | 0,296 | - |
| Yes | 63,51 | 51,06 | 0,246 | 0.022 | |
| Martin (Acridotheres tristis) presence on the ruminants | No | 70,27 | 34,62 | 0,22 | - |
| Yes | 29,73 | 54,55 | 0,296 | 0.091 | |
| Access to a water point on the pasture | No | 66,22 | 40,82 | 0,265 | - |
| Yes | 32,43 | 40,00 | 0,253 | 0,121 | |
| Antibiotic treatment after abortion | No | 72,97 | 31,48 | 0,241 | - |
| Yes | 27,03 | 65,00 | 0,241 | 0.097 | |
| No specific protection for a visitor entering the farm | No | 54,05 | 22,50 | 0,097 | - |
| Yes | 45,95 | 61,76 | 0,138 | 2.81.10-7 | |
| Quarantine | No | 56,76 | 64,29 | 0,135 | - |
| Yes | 43,24 | 9,38 | 0,123 | 4.210.10-7 | |
| Sale and purchase of animals | No | 47,30 | 11,43 | 0,104 | - |
| Yes | 52,70 | 66,67 | 0,134 | 6.100.10-5 | |