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Table 1 The demographic characteristics of PJI patients included in this study

From: The risk factors of polymicrobial periprosthetic joint infection: a single-center retrospective cohort study

characteristic Polymicrobial Monomicrobial P value
PJI n = 64 PJI n = 158
Age (years)* 63.5 (38–74) 66 (36–82) 0.012
Knees, n (%) 24 (37.5%) 94 (59.5%) 0.003
Male, n (%) 27 (42.2%) 70, (44.9%) 0.773
Body Mass Index*(Kg/m2) 25.6 (18.4–33.3) 25.3 (15.6–48.6) 0.637
Sinus tract, n (%) 31 (48.4%) 17 (10.8%) < 0.001
CRP * (mg/dL) 1.26(0.3–5.6) 3.37(0.07–20.9) 0.385
ESR * (mm/h) 44(8–123) 51 (4–111) 0.489
Previous revisions, n (%) 30 (46.9%) 43(27.2%) 0.005
PJI 25(83.3%) 31(72.1%)  
Aseptic loosening 4(13.33%) 2(4.6%)  
Dislocation 0 1(2.3%)  
Periprosthetic fracture 0 2(4.6%)  
Other reasons 1(3.33%) 7(16.3%)  
Acute PJI** 9(14.1%) 20(12.7%) 0.779
Synovial fluid polymorphonuclear neutrophils (%) * 63(70–96) 64(3–98) 0.923
Synovial fluid white blood-cell count (cells/mL) * 10,600(260–66,400) 15,440(300–102,580) 0.907
  1. * Values were given as medians with the range in the parentheses
  2. ** Acute PJI: the PJI occurred with first postoperative month