Variables | Number of studies | Number of pigs tested | Number of pgs positive for C. suis | Percentage pigs positive for C. suis (95% CI) | Heterogeneity | Univariate meta-regression | Joint analysis | |||
---|---|---|---|---|---|---|---|---|---|---|
χ2 | P value | I2 (%) | P value | Coefficient (95% CI) | Adjusted R2 | |||||
Regiona | 0.013 | − 1.542 (− 2.757 to − 0.327) | 56.16% | |||||||
North China | 1 | 230 | 91 | 39.6% (33.7–46.4) | 0.00 | – | – | |||
Northwest China | 3 | 1636 | 69 | 4.7% (3.3–6.7) | 3.21 | < 0.01 | 37.7% | |||
East China | 6 | 3953 | 362 | 10.2% (5.6–18.6) | 136.20 | 0.00 | 96.3% | |||
Central China | 5 | 6741 | 527 | 7.3% (5.2–10.4) | 62.66 | < 0.01 | 93.6% | |||
South China | 4 | 2510 | 358 | 8.3% (2.9–23.9) | 80.55 | < 0.01 | 96.3% | |||
Southwest China | 6 | 4621 | 344 | 10.3% (5.7–18.6) | 150.67 | 0.00 | 96.7% | |||
Detection methods | 0.026 | 0.631 (0.076–1.187) | 22.22% | |||||||
Centrifugal flotation method | 4 | 1701 | 110 | 9.4% (3.8–23.3) | 69.28 | 95.7% | ||||
Flotation method (NaCl) | 11 | 8020 | 651 | 7.1% (4.6–11.1) | 259.96 | 0.00 | 96.2% | |||
Flotation method (NaCl, Suc) | 7 | 6665 | 860 | 13.9% (8.8–22.2) | 324.16 | 98.1% | ||||
Flotation method (Suc) | 1 | 50 | 28 | 56% (43.8–71.6) | 0.00 | – | – | |||
Others | 2 | 2673 | 278 | 11.2% (8.3–15.0) | 5.25 | 0.00 | 81.0% | |||
Sampling years | 0.003 | 0.842 (0.291–1.394) | 54.24% | |||||||
2000 or earlier | 8 | 2179 | 117 | 5.5% (3.7–8.3) | 29.70 | < 0.01 | 76.4% | |||
2001 to 2011 | 10 | 11303 | 1107 | 12.1% (8.1–18.0) | 441.98 | < 0.01 | 98.0% | |||
2012 or later | 5 | 5363 | 659 | 14.4% (8.6–24.3) | 204.10 | 0 | 98.0% | |||
Pig ages | 0.001 | − 0.975 (− 1.418 to − 0.532) | 51.36% | |||||||
Suckling piglets | 14 | 7072 | 1006 | 14.9% (10.9–20.4) | 586.99 | < 0.01 | 96.6% | |||
Weaning pigs | 9 | 3286 | 202 | 5.5% (3.5–8.7) | 73.97 | < 0.01 | 89.2% | |||
Growing pigs | 6 | 2441 | 133 | 5.8% (3.7–9.0) | 33.34 | < 0.01 | 82.0% | |||
Finishing pigs | 2 | 528 | 32 | 6.3% (4.1–9.6) | 2.72 | < 0.01 | 26.4% | |||
Feeding model | 0.081 | 0.722 (0.021–1.533) | 34.43% | |||||||
Extensive | 4 | 3202 | 223 | 5.1% (3.0–8.5) | 15.35 | < 0.01 | 80.5% | |||
Intensive | 14 | 10991 | 1145 | 10.0% (6.9–14.6) | 562.01 | < 0.01 | 97.7% | |||
Total | 26 | 20470 | 1834 | 9.1% (6.9–11.9) | 885.02 | 0.000 | 97.2% |