Variable | Category | Numbers of herd-years | Numbers of herd-years with outbreak | Proportion | OR univariate | 95% CI | P-value |
---|---|---|---|---|---|---|---|
Feeding overall | No | 134 | 33 | 0.25 | Reference | ||
Yes | 284 | 93 | 0.33 | 1.30 | 0.15–11.58 | 0.82 | |
Feeding in enclosure | No | 276 | 68 | 0.25 | Reference | ||
Yes | 142 | 58 | 0.41 | 11.59 | 1.75–77.01 | 0.01 | |
Free-range feeding | No | 167 | 43 | 0.26 | Reference | ||
Yes | 251 | 83 | 0.33 | 0.29 | 0.05–1.72 | 0.17 | |
Herd size | < 500 | 134 | 40 | 0.30 | Reference | ||
500–999 | 83 | 29 | 0.35 | 1.54 | 0.02–123.80 | 0.85 | |
1000–1999 | 82 | 16 | 0.20 | 0.88 | 0.01–102.49 | 0.96 | |
> 1999 | 119 | 41 | 0.35 | 1.14 | 0.02–71.51 | 0.95 | |
Regions | Norrbotten | 129 | 45 | 0.35 | Reference | ||
Västerbotten | 56 | 15 | 0.27 | 1.33 | 0.01–211.03 | 0.91 | |
Dalarna/Jämtland | 36 | 6 | 0.17 | 0.21 | 0.00–305.97 | 0.68 | |
Finmark | 102 | 30 | 0.29 | 0.50 | 0.01–38.98 | 0.76 | |
Nordland/Troms | 59 | 24 | 0.41 | 1.23 | 0.01–213.52 | 0.93 | |
Trondelag/Hedmark | 36 | 6 | 0.17 | 0.21 | 0.00–305.94 | 0.68 | |
Country | Norway | 197 | 60 | 0.31 | Reference | ||
Sweden | 221 | 66 | 0.30 | 1.48 | 0.06–36.36 | 0.81 | |
Herding year | 2015–2016 | 67 | 17 | 0.25 | Reference | ||
2016–2017 | 68 | 20 | 0.29 | 3.21 | 0.42–24.73 | 0.26 | |
2017–2018 | 67 | 18 | 0.27 | 1.36 | 0.17–11.02 | 0.77 | |
2018–2019 | 72 | 25 | 0.35 | 6.83 | 0.89–52.29 | 0.06 | |
2019–2020 | 72 | 26 | 0.36 | 10.14 | 1.29–79.90 | 0.03 | |
2020–2021 | 72 | 20 | 0.28 | 0.81 | 0.11–6.15 | 0.84 |