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Table 1 Procedure characteristics*

From: Staphylococcus aureus infections following knee and hip prosthesis insertion procedures

   Prosthetic knee insertion Prosthetic hip insertion
   (N=8,446) (N=5,273)
NHSN risk index 0 2,404 (28) 1,174 (22)
  1 4,316 (51) 2,977 (56)
  ≥2 1,356 (16) 984 (19)
  Missing 370  ( 4) 138  ( 3)
ASA score 1: Healthy 600 ( 7) 131  ( 2)
  2: Mild Systemic Disease 3,622 (43) 2,152 (41)
  3: Severe Systemic Disease 3,855 (46) 2,423 (46)
  4: Incapacitating Disease 323  ( 4) 526 (10)
  5: Dying 0  ( 0) 1  ( 0)
  6: Emergency Care 0  ( 0) 0  ( 0)
  Missing 46  ( 1) 40  ( 1)
Wound class Clean 8,142 (96) 5,029 (95)
  Clean - contaminated 304  ( 4) 244  ( 5)
Age, median (years)   63   67  
Age category 18-29 395  ( 5) 78  ( 1)
(years) 30-39 421  ( 5) 204  ( 4)
  40-49 809 (10) 609 (12)
  50-59 1,776 (21) 900 (17)
  60-69 2,347 (28) 1,082 (21)
  70-79 2,059 (24) 1,271 (24)
  80+ 639  ( 8) 1,129 (21)
Hospital Community (N=9) 4,442 (53) 3,160 (60)
Type Tertiary (N=2) 4,004 (47) 2,113 (40)
  1. *Data shown as n (%) of patients, unless otherwise indicated.