Table 1

Patient characteristics for (A) hip arthroplasty procedures (May 2010 to September 2013) and (B) knee arthroplasty procedures (May 2010 to September 2013).

(A) Hip arthroplasty procedures
(May 2010 – to September 2013)
Comparison states (n=131 787)Intervention states (n=125 070)Directly participating hospitals in intervention states (n=62 595)
Age, mean (SD)76.3 (10.1)75.6 (10.2)75.7 (10.3)
Female (%)65.565.165.3
Comorbidities
 Congestive heart failure (%)9.88.99.2
 Diabetes (uncomplicated and complicated), %18.918.519.0
 Obesity (%)9.39.18.9
 Peripheral vascular disease (%)4.54.34.2
 Renal failure (%)10.69.89.8
Length of stay for surgical admission, mean (SD)4.4 (3.0)4.5 (3.7)4.4 (3.7)
(B) Knee arthroplasty procedures
(May 2010 – September 2013)
Comparison states (n=196 064)Intervention states (n=170 663)Directly participating hospitals in intervention states (n=88 523)
Age, mean (SD)72.1 (7.8)71.8 (8.0)71.7 (8.1)
Female (%)64.665.665.9
Comorbidities
 Congestive heart failure (%)4.03.93.9
 Diabetes (uncomplicated and complicated), %24.223.824.3
 Obesity (%)18.717.717.3
 Peripheral vascular disease (%)2.52.52.5
 Renal failure (%)6.36.16.0
Length of stay for surgical admission, mean (SD)3.3 (1.4)3.3 (1.6)3.2 (1.6)