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Table 2 Overall Eperythrozoon infection rate by selected variables

From: Infection rate of Eperythrozoon spp. in Chinese population: a systematic review and meta-analysis since the first Chinese case reported in 1991

Variable   Number of countributing studies Total tested Eperythrozoon positive Crude infection rate (95% CI) OR/Adjusted OR by area (95% CI) Heterogeneity chi-square Pvalue Publication bias
Gender Male 8 7129 2933 41.14 Ref. None
    (40.00 - 42.28)    
Female 8 7408 3127 42.21 1.03 26.02 <0.01
    (41.09 - 43.33) (0.86 - 1.24)   
Age of enrolled population (yrs) ≤19 4 1771 1342 75.78 Ref.
    (73.78 -77.77)    
20-39 5 9288 1738 18.71 0.55 67.52# <0.01
    (17.92 -19.51) (0.48 - 0.64)   
40-59 5 9330 1310 14.04 0.59 47.20 # <0.01
    (13.34 -14.75) (0.50 - 0.68)   
≥60 5 3459 411 11.88 0.80 5.80# 0.02
    (10.80 -12.96) (0.67 - 0.96)   
Age       94.47# <0.01
Area       3980.23# <0.01
Occupation Employees with the food industry exceptional 2 413 212 51.33 Ref.
    (46.51 - 56.15)    
Employees in the food industry 3 1458 832 57.06 0.85 1.45# 0.23
    (54.52 - 59.60) (0.66 - 1.10)   
Farmers 4 1551 754 48.61 1.98 4.78# 0.03
     (46.12 - 51.10) (1.07 - 3.64)   
Herdsmen 6 530 296 55.85 3.65 27.34# <0.01
     (51.62 - 60.08) (2.25 - 5.93)   
Occupation       44.75# <0.01
Area       641.56# <0.01
Contact history of animals No 3 5548 575 10.36 Ref. None
     (9.56 - 11.17)    
Yes 3 1413 808 57.18 6.40 233.38 <0.01
      (54.60 - 59.76) (5.50 - 7.37)    
Season Winter & Spring 2 9127 460 5.04 Ref.   
      (4.59 - 5.49)     
Summer & Autumn 2 10178 1564 15.37 4.26 6.91 <0.01
      (14.67 - 16.07) (3.01 - 6.02)    
Location Urban area 2 839 633 75.45 Ref.
      (72.54 - 78.36)     
Rural area 2 1456 1190 81.73 (79.75 - 83.71) 2.83 (0.36 - 22.55) 21.86 <0.01
  1. # Wald Chi-square; † Unable to evaluate.