(a) Environmental factors
|
Relative risk for ducks |
|
≤ 0.5 |
2 769 |
1.00 |
|
|
|
|
0.51–1.5 |
825 |
0.76 |
0.63–0.91 |
|
|
|
1.51–10 |
1 310 |
1.86 |
1.55–2.22 |
|
|
|
≥ 10.01 |
2 462 |
13.11 |
10.92–15.73 |
|
|
Relative risk for chickens |
|
≤ 0.5 |
3 175 |
|
|
1.00 |
|
|
0.51–1.5 |
633 |
|
|
1.10 |
0.86–1.42 |
|
1.51–10 |
1 824 |
|
|
6.13 |
4.83–7.78 |
|
≥ 10.01 |
1 734 |
|
|
33.86 |
26.33–43.53 |
Average altitude (m) |
|
≥ 400.01 |
632 |
1.00 |
|
1.00 |
|
|
150.01–400 |
2 605 |
0.38 |
0.32–0.45 |
0.27 |
0.21–0.34 |
|
50.01–150 |
1 701 |
0.53 |
0.45–0.63 |
0.24 |
0.19–0.30 |
|
≤ 50 |
2 428 |
5.73 |
4.77–6.90 |
10.16 |
7.89–13.09 |
Mean number of rice crops per year |
|
≤ 0.2 |
1 167 |
1.00 |
|
1.00 |
|
|
0.21–1 |
2 405 |
0.77 |
0.65–0.92 |
0.88 |
0.70–1.10 |
|
1.01–1.5 |
3 308 |
1.47 |
1.24–1.76 |
1.12 |
0.88–1.42 |
|
≥ 1.51 |
486 |
11.21 |
9.15–13.73 |
17 |
12.89–22.42 |
Distance to the closest river (km) |
|
≥ 10.01 |
1 328 |
1.00 |
|
1.00 |
|
|
5.01–10 |
1 509 |
0.68 |
0.57–0.82 |
0.59 |
0.47–0.75 |
|
2.01–5 |
1 966 |
0.83 |
0.69–0.99 |
0.74 |
0.58–0.94 |
|
≤ 2 |
2 563 |
2.05 |
1.71–2.46 |
2.88 |
2.25–3.69 |
(b) Poultry farming factors
|
Density of native chickens (no poultry/km2) |
|
≤ 50 |
1 441 |
1.00 |
|
1.00 |
|
|
50.01–100 |
1 324 |
1.12 |
0.94–1.33 |
1.57 |
1.24–2.00 |
|
100.01–300 |
3 319 |
0.73 |
0.61–0.87 |
0.52 |
0.41–0.66 |
|
≥ 300.01 |
1 282 |
0.52 |
0.43–0.63 |
0.46 |
0.36–0.60 |
Density of fighting cocks (no poultry/km2) |
|
≤ 0.1 |
4 191 |
1.00 |
|
1.00 |
|
|
0.11–1 |
1 682 |
0.59 |
0.50–0.71 |
0.53 |
0.42–0.67 |
|
1.01–3 |
832 |
0.75 |
0.62–0.91 |
0.62 |
0.48–0.80 |
|
≥ 3.01 |
661 |
1.52 |
1.24–1.87 |
2.3 |
1.75–3.03 |
Density of houses with fighting cocks (no house/km2) |
|
≤ 0.01 |
3 152 |
1.00 |
|
1.00 |
|
|
0.01–0.1 |
2 163 |
0.67 |
0.56–0.79 |
0.69 |
0.55–0.87 |
|
0.11–0.4 |
1 439 |
0.86 |
0.71–1.04 |
0.73 |
0.57–0.94 |
|
≥ 0.41 |
612 |
1.26 |
1.01–1.54 |
1.59 |
1.21–2.10 |
Density of free-grazing ducks (no poultry/km2) |
|
≤ 0.1 |
5 953 |
1.00 |
|
1.00 |
|
|
0.11–10 |
779 |
0.68 |
0.57–0.83 |
0.37 |
0.29–0.48 |
|
≥ 10.01 |
634 |
10.13 |
8.29–12.37 |
18.26 |
13.88–24.04 |
Density of farms with free-grazing ducks (no farm/km2) |
|
≤ 0.001 |
4 539 |
1.00 |
|
n.s. |
n.s. |
|
0.0011–0.05 |
1 367 |
0.65 |
0.54–0.78 |
n.s. |
n.s. |
|
≥ 0.051 |
1 460 |
1.61 |
1.33–1.96 |
n.s. |
n.s. |
Density of broiler and layer chickens (no poultry/km2) |
|
≤ 1 |
2 997 |
n.s. |
n.s. |
1.00 |
|
|
1.01–50 |
2 475 |
n.s. |
n.s. |
0.78 |
0.61–0.98 |
|
50.01–500 |
1 076 |
n.s. |
n.s. |
0.68 |
0.53–0.88 |
|
≥ 500.01 |
818 |
n.s. |
n.s. |
3.04 |
2.34–3.95 |
Density of farms with broiler and layer chickens (no farm/km2) |
|
≤ 0.01 |
932 |
1.00 |
|
1.00 |
|
|
0.011–0.05 |
1 092 |
0.78 |
0.65–0.93 |
0.75 |
0.59–0.94 |
|
0.051–1 |
4 794 |
1.01 |
0.85–1.21 |
1.03 |
0.81–1.31 |
|
≥ 1.01 |
548 |
0.61 |
0.50–0.75 |
0.66 |
0.50–0.87 |
Density of broiler and layer ducks (no poultry/km2) |
|
≤ 5 |
3 374 |
1.00 |
|
1.00 |
|
|
5.01–20 |
2 195 |
0.96 |
0.80–1.15 |
0.62 |
0.49–0.79 |
|
20.01–80 |
1 222 |
0.97 |
0.81–1.17 |
0.51 |
0.39–0.65 |
|
≥ 80.01 |
575 |
4.6 |
3.76–5.63 |
6.85 |
5.19–9.04 |
Density of farms with broiler and layer ducks (no farm/km2) |
|
≤ 0.5 |
3 228 |
1.00 |
|
1.00 |
|
|
0.51–1 |
1 471 |
1.41 |
1.18–1.69 |
1.32 |
1.03–1.69 |
|
1.01–2 |
1 423 |
1.22 |
1.02–1.47 |
0.88 |
0.69–1.13 |
|
≥ 2.01 |
1 244 |
0.7 |
0.58–0.84 |
0.28 |
0.22–0.36 |
(c) Anthropogenic factors
|
Road density |
|
≤ 0.001 |
1 897 |
1.00 |
|
1.00 |
|
|
0.0011–0.002 |
1 849 |
0.73 |
0.61–0.87 |
0.68 |
0.54–0.86 |
|
0.0021–0.005 |
2 538 |
0.69 |
0.58–0.82 |
0.46 |
0.36–0.58 |
|
≥ 0.0051 |
1 082 |
4 |
3.32–4.82 |
6.82 |
5.29–8.80 |
Density of human population (km2) |
|
≤ 100 |
2 206 |
1.00 |
|
1.00 |
|
|
100.01–300 |
3 744 |
0.86 |
0.72–1.02 |
0.57 |
0.45–0.72 |
|
300.01–600 |
758 |
2.61 |
2.15–3.18 |
4.18 |
3.19–5.46 |
|
≥ 600.01 |
658 |
5.56 |
4.62–6.68 |
11.61 |
9.04–14.90 |
Distance to the closest highway (km) |
|
≥ 50.01 |
1 021 |
1.00 |
|
1.00 |
|
|
20.01–50 |
2 109 |
0.76 |
0.64–0.91 |
0.52 |
0.41–0.66 |
|
5.01–20 |
2 494 |
1.19 |
0.99–1.43 |
1.28 |
1.01–1.64 |
|
≤ 5 |
1 742 |
1.96 |
1.63–2.35 |
2.84 |
2.21–3.63 |
Distance to the closest highway junction (km) |
|
≥ 100.01 |
1 964 |
1.00 |
|
1.00 |
|
|
50.01–100 |
2 569 |
0.78 |
0.66–0.94 |
0.78 |
0.61–0.99 |
|
20.01–50 |
1 863 |
2.09 |
1.75–2.51 |
2.81 |
2.19–3.60 |
|
≤ 20 |
970 |
6.15 |
5.13–7.38 |
9.46 |
7.38–12.13 |
Distance to the closest major city (km) |
|
≥ 80.01 |
3 427 |
1.00 |
|
1.00 |
|
|
40.01–80 |
2 176 |
1.15 |
0.96–1.37 |
1.02 |
0.80–1.30 |
|
20.01–40 |
965 |
1.78 |
1.48–2.15 |
2.06 |
1.60–2.66 |
|
≤ 20 |
798 |
4.14 |
3.44–4.98 |
7.12 |
5.53–9.15 |