Table 6.

Determinants of hospital cost of ORIF and hemiarthroplasty

Factor	Cost (US dollars) (n = 14,202)
Surgeon volume*,†	−90 ± 11‖
Female	−2864 ± 296‖
Hemiarthroplasty‡	2414 ± 197‖
Charlson Comorbidity Index†	394 ± 27‖
Age
< 50 years	1301.81 ± 554
50–64 years	−11 ± 404
65–79 years	−168 ± 205
≥ 80 years	Reference group
Primary payer
Medicaid	2536 ± 920‖
Private insurance	1046 ± 382‖
Other§	1489 ± 527‖
Medicare	Reference group

Values are expressed as mean ± standard error; * surgeon volume includes total shoulder arthroplasty and hemiarthroplasty; surgeon identifier not present for surgeons in CA, CT, GA, HI, IL, IN, KS (2001–2004), MA, NC, OH, OK (2005– 2008), and UT, VT, WI, WV (2004–2008); ^†used as a continuous variable; ^‡compared with ORIF; ^§other includes Workers Compensation, Civilian Health and Medical Program of Uniformed Service, Civilian Health and Medical Program of the Department of Veterans Affairs, Title V, and other government programs; ^‖p < 0.01; ^¶p < 0.05; ORIF = open reduction and internal fixation.