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Table 1 Demographic characteristics

From: Predictors of the use of analgesic drugs 1 year after joint replacement: a single-center analysis of 13,000 hip and knee replacements

 Hip replacementKnee replacement
Total number, n62387501
Age, mean (SD), years67.59 (10.63)69.67 (9.52)
Female53.2%67.7%
Bilateral operation, n (%)418 (6.7%)1225 (16.3%)
BMI, mean (SD), kg/m2*28.2 (4.7)29.9 (4.8)
Charlson Comorbidity Index**
 04685 (75.1%)5239 (69.8%)
 11128 (18.1%)1621 (21.6%)
 > 2425 (6.8%)641 (8.5%)
Diabetes, n (%)473 (7.6%)744 (9.9%)
Cardiac disease***, n (%)699 (11.2)904 (12.1%)
Psychotic disorder, n (%)92 (1.5%)137 (1.8%)
Neurodegenerative disease (Alzheimer or Parkinson), n (%)86 (1.4%)111 (1.5%)
Pulmonary disease, n (%)373 (6.0%)619 (8.3%)
Hypertension, n (%)1656 (26.5%)2491 (33.2%)
History of malignancy, n (%)182 (2.9%)273 (3.6%)
Epilepsy, n (%)67 (1.1%)74 (1.0%)
Antidepressant****, n (%)621 (10.0%)840 (11.2%)
Preoperative analgesic use, n (%)
 Any analgesic2959 (47.4%)2960 (39.5%)
 Acetaminophen870 (13.9%)894 (11.9%)
 NSAID2095 (33.6%)1983 (26.4%)
 Opioid870 (13.9%)685 (9.1%)
KSS Knee Score, n (%)
 Poor (< 60) 3965 (52.9%)
 Fair (60–70) 642 (8.6%)
 Good or excellent (> 70) 277 (3.7%)
 Missing 2617 (34.9%)
KSS Function Score, n (%)
 Poor (< 60) 2760 (36.8%)
 Fair (60–70) 623 (8.3%)
 Good or Excellent (> 70) 1473 (19.6%)
 Missing 2645 (35.3%)
Harris Hip Score, n (%)
 Poor (< 70)3801 (60.9%) 
 Fair (70–80)240 (3.8%) 
 Good or excellent (> 80)59 (0.9%) 
 Missing2138 (34.3%) 
  1. SD standard deviation, BMI body mass index
  2. *Missing on 825 (13.2%) of hip and 997 (13.3%) of knee patients
  3. ** Modified Charlson Comorbidity Index
  4. ***Coronary artery disease, heart failure, chronic arrhythmia
  5. ****Redeemed antidepressant 1 year before surgery