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Table 2 Time trends in demographics and clinical characteristics of patients undergoing primary THA, in %, unless specified otherwise

From: Increasing obesity and comorbidity in patients undergoing primary total hip arthroplasty in the U.S.: A 13-year study of time trends

  1993-1995 1996-1998 1999-2001 2002-2005 P-value
Age category      0.002
 <50 13.7 17.1 16.2 16.0  
 50- < 65 24.7 25.9 26.6 27.5  
 65- <80 51.8 48.8 47.2 44.9  
 ≥80 9.8 8.2 10.0 11.6  
Mean age (SD) 65.0 (13.2) 63.5 (14.0) 63.9 (14.0) 64.3 (13.9) 0.03
Female gender 51.8 50.0 52.0 51.9 0.67
BMI      <0.001
 <25 28.1 26.0 24.0 21.5  
 25 29.9 38.8 40.0 37.9 37.2  
 30 34.9 23.5 24.1 23.6 25.8  
 35 39.9 7.3 6.6 9.1 9.3  
 ≥40 2.3 3.3 5.3 6.3  
Mean BMI (SD) 28.0 (5.2) 28.3 (5.2) 29.1 (6.0) 29.6 (6.2) <0.001
Operative Diagnosis      <0.001
 Osteoarthritis 81.8 81.0 88.2 92.2  
 RA/inflammatory arthritis 3.7 3.7 2.4 1.3  
 Other 14.5 15.3 9.4 6.5  
Deyo-Charlson Index      <0.001
 0 61.9 63.2 59.2 56.7  
 1 17.3 17.2 15.4 16.2  
 2 8.7 9.3 11.0 11.9  
 3 or more 12.2 10.2 14.4 15.1  
Depression 4.5 4.8 7.2 9.8 <0.001
Anxiety 3.4 3.5 4.9 5.7 0.003
  1. SD, standard deviation; RA, rheumatoid arthritis, BMI, body mass index.
  2. Significant p-values are in bold. We used analysis of variance for continuous variables and, chi-squared test for categorical variables.