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Table 1 Demographics

From: Risk factors for reoperation due to periprosthetic joint infection after elective total hip arthroplasty: a study of 35,056 patients using linked data of the Swedish Hip Arthroplasty Registry (SHAR) and Swedish Perioperative Registry (SPOR)

Factor Categorization Numbers (%) if not stated otherwise Missing (%)
Patient characteristics
 Sex Male 14,869 (42.4%) 0.0
Female 20,187 (57.6%)  
 Age, mean (SD)   69.5 (10.5) 0.0
 Age group < 55 3228 (9.2%) 0.0
55–69 12,303 (35.1%)  
70–84 17,786 (50.7%)  
85+ 1739 (5.0%)  
 ASA classification ASA I 6087 (17.4%) 0.2
ASA II 21,147 (60.4%)  
ASA III and IV 7769 (22.2%)  
 BMI, mean (SD)   27.5 (4.5) 1.1
BMI class
Normal weight and underweight <  18.5–24.9 10,555 (30.5%)  
Overweight 25–29.9 14,570 (42.0%)  
Obesity class 1 30–34.9 7303 (21.1%)  
Obesity class 2/3 > 35 2225 (6.4%)  
Smoking status Non-smoker 28,797 (95.1%) 13.6
Smoker 1484 (4.9%)  
Diagnosis Primary osteoarthritis 32,097 (91.6%) 0.0
Other 2977 (8.4%)  
Reoperation due to PJI within 1 year   460 (1.3%)  
Intraoperative characteristics
 Level of hospital University hospital 2466 (7.0%) 0.0
County hospital 28,553 (81.4%)  
Private hospital 4037 (11.4%)  
 Anesthesia Spinal 28,361 (86.7%) 6.7
General 4346 (13.3%)  
 Incision Lateral 15,905 (45.4%) 0.0
Posterior 18,755 (53.5%)  
Other 394 (1.1%)  
 Fixation Cemented 20,861 (59.6%) 0.2
Uncemented 8631 (24.7%)  
Hybrid 5502 (15.7%)  
Operative time, mean minutes (SD)    0.0
Overall mean (SD)   85.4 (28.9)  
Operative time cemented mean (SD)   90.2 (27.9)  
Operative uncemented mean (SD)   76.9 (28.7)  
Operative time hybrid mean (SD)   80.6 (29.1)  
Type of ventilation Unidirectional airflow 29,762 (84.9%) 0.0
Mixed turbulent airflow 5294 (15.1%)  
  1. SD Standard Deviation, ASA American Society of Anesthesiologists Physical Status Classification System, BMI Body Mass Index, PJI Periprosthetic Joint Infection
  2. Demographics for the studied population Numbers (%) unless otherwise specified (mean, SD)