Table 2.
Results of the subgroup analyses on PDCoV infection among pigs in China.
| category | Subgroup | No. studies | No. examined | No. positive | Prevalence (%) (95%CI) | Heterogeneity | ||
|---|---|---|---|---|---|---|---|---|
| I2(%) | p-value | Х2 | ||||||
| Region | Central China | 5 | 3,703 | 991 | 24.5 (16.1–32.9) | 95.6 | 0.000 | 90.02 |
| North China | 4 | 3,090 | 640 | 18.5 (9.7–27.3) | 97. 3 | 0.000 | 111.03 | |
| South China | 11 | 7,773 | 691 | 12.2 (9.0–15.3) | 96.9 | 0.000 | 322.64 | |
| East China | 6 | 2,774 | 272 | 10.8 (5.4–16.1) | 97.3 | 0.000 | 182.69 | |
| Southwest China | 6 | 1713 | 184 | 10.2 (5.4–15.1) | 92.3 | 0.000 | 65.28 | |
| Northeast China | 1 | 672 | 26 | 3.9 (2.4–5.3) | - | - | 0.00 | |
| Northwest China | 4 | 2,916 | 65 | 3.1 (1.1–5.2) | 89.2 | 0.000 | 27.79 | |
| Sampling year | Before 2014 | 5 | 2008 | 411 | 15.6 (4.5–26.8) | 98.3 | 0.000 | 237.32 |
| 2015 | 4 | 1,269 | 253 | 20.5 (10.1–31.0) | 94.8 | 0.000 | 57.69 | |
| 2016 | 9 | 2,490 | 454 | 18.2 (12.3–24.0) | 93.9 | 0.000 | 130.54 | |
| 2017 | 13 | 4,084 | 621 | 12.7 (8.0–17.4%) | 97.4 | 0.000 | 469.30 | |
| 2018 | 13 | 6,385 | 559 | 11.3 (7.6–14.9) | 97.7 | 0.000 | 523.71 | |
| 2019 | 6 | 2,648 | 129 | 8.8 (5.1–12.6) | 90.2 | 0.000 | 50.92 | |
| 2020 | 2 | 2,318 | 46 | 2.0 (1.3–2.6) | 2.3 | 0.312 | 1.02 | |
| 2021 | 3 | 2,677 | 103 | 4.8 (2.3–7.3) | 88.5 | 0.000 | 17.34 | |
| Pig stage | Sow | 9 | 1,685 | 418 | 23.6 (15.8–31.4) | 93.1 | 0.000 | 115.42 |
| Suckling piglet | 9 | 4,381 | 927 | 20.4 (11.5–29.4) | 98.6 | 0.000 | 552.45 | |
| Nursery piglet | 3 | 857 | 107 | 10.9 (2.5–19.3) | 94.1 | 0.000 | 33.83 | |
| Finishing pig | 3 | 422 | 61 | 14.1 (9.0–19.3) | 53.4 | 0.117 | 4.29 | |