Table 2.
Pooled prevalence of CM infection in cattle in mainland China.
| No. studies | No. tested | No. positive | % (95% CI) | Heterogeneity | ||||
|---|---|---|---|---|---|---|---|---|
| χ2 | P -value | I2 (%) | ||||||
| Region | Northeast China | 11 | 45,182 | 53,22 | 12% (10–15) | 30.79 | 0.000 | 96.7% |
| North China | 9 | 33,213 | 3,904 | 8% (5–11) | 112.83 | 0.000 | 98.8% | |
| Northwest China | 10 | 71,672 | 2,107 | 7% (5–10) | 661.28 | 0.000 | 96.7% | |
| East China | 12 | 6,022 | 446 | 8% (6–10) | 305.11 | 0.000 | 90.3% | |
| South China | 1 | 387 | 135 | 35% (30–40) | 650.59 | 0.0% | ||
| Central China | 4 | 25,255 | 1,865 | 9% (5–13) | 0.00 | 0.000 | 90.3% | |
| Southwest China | 5 | 1,490 | 145 | 11% (6–17) | 55.34 | 0.000 | 92.8% | |
| Published time | >10 years/before 2012 | 23 | 40,999 | 3,220 | 10% (8–11) | 597.70 | 0.000 | 96.3% |
| < 10 years/2012 or later | 24 | 1,42,222 | 10,704 | 10% (8–13) | 6297.97 | 0.000 | 99.6% | |
| Age | 2 | 4 | 1,921 | 88 | 4% (1–7) | 33.37 | 0.000 | 91.0% |
| 3 | 4 | 1,166 | 86 | 8% (2–13) | 50.76 | 0.000 | 94.1% | |
| 4 | 5 | 3,279 | 264 | 8% (4–12) | 65.64 | 0.000 | 93.9% | |
| 5 | 5 | 2,456 | 314 | 12% (6–19) | 101.72 | 0.000 | 96.1% | |
| 6 | 5 | 2,424 | 342 | 13% (9–17) | 33.25 | 0.000 | 88% | |
| 7 | 2 | 671 | 126 | 10% (8–25) | 2.60 | 0.107 | 61.6% | |
| >7 | 6 | 2,237 | 377 | 16% (12–19) | 29.18 | 0.000 | 82.9% | |
| Not found | 37 | 1,69,022 | 12,327 | 10% (8–12) | 6581.18 | 0.000 | 99.4% | |
| Parity | 1 | 16 | 14,945 | 616 | 5% (4–5) | 53.23 | 0.000 | 71.8% |
| 2 | 15 | 13,323 | 852 | 7% (6–8) | 83.30 | 0.000 | 83.2% | |
| 3 | 15 | 13,507 | 858 | 8% (7–10) | 83.77 | 0.000 | 83.3% | |
| 4 | 15 | 11,691 | 1,202 | 11% (9–13) | 126.95 | 0.000 | 89% | |
| 5 | 15 | 9,323 | 1,127 | 13% (11–16) | 114.93 | 0.000 | 87.8% | |
| 6 | 9 | 5886 | 941 | 16% (13–18) | 23.67 | 0.003 | 66.2% | |
| ≥6 | 15 | 9,772 | 2,073 | 19% (15–23) | 222.47 | 0.000 | 93.7% | |
| Not found | 31 | 1,04,774 | 6,255 | 10% (8–12) | 3829.78 | 0.000 | 99.2% | |
| Lactation | Early lactation | 7 | 1,558 | 119 | 8% (5–10) | 21.85 | 0.001 | 72.5% |
| Mid lactation | 7 | 2,789 | 329 | 10% (6–13) | 61.64 | 0.000 | 90.3% | |
| Late lactation | 13 | 4,796 | 829 | 15% (11–18) | 110.91 | 0.000 | 89.2% | |
| Not found | 40 | 1,74,067 | 12,647 | 10% (8–12) | 6636.43 | 0.000 | 99.4% | |
| quarter | Left front | 14 | 19,480 | 1,322 | 6% (4–7) | 227.71 | 0.000 | 94.3% |
| Left Rear | 14 | 19,485 | 1,359 | 6% (4–7) | 220.23 | 0.000 | 94.1% | |
| Right front | 14 | 19517 | 1,333 | 6% (4–7) | 219.66 | 0.000 | 94.1% | |
| Right rear | 14 | 19,402 | 1,388 | 6% (5–8) | 241.37 | 0.000 | 94.6% | |
| Not found | 33 | 164829 | 11500 | 9% (7–11) | 6128.26 | 0.000 | 99.5% | |
| Season | Spring | 8 | 33,532 | 1,762 | 8% (4–11) | 986.54 | 0.000 | 99.3% |
| Summer | 3 | 16460 | 408 | 8% (3–14) | 90.18 | 0.003 | 97.8% | |
| Autumn | 4 | 29,478 | 2,233 | 9% (2–17) | 1540.58 | 0.000 | 99.8% | |
| Winter | 3 | 15,754 | 421 | 4% (2–7) | 12.13 | 0.002 | 83.5% | |
| Not found | 38 | 87,997 | 9,100 | 11% (9–12) | 1830.29 | 0.000 | 98% | |
| Total | 47 | 1,83,221 | 13,924 | 10% (9–12) | 0.000 | 99.4% | ||