Table 6.

Additional risk on transfusion with every increasing CCI score (%) per orthopaedic subspecialty

Orthopaedic subspecialty	Additional risk	95% CI		p value
		Lower	Upper
Arthroplasty	0.11	0.000027	0.0022	0.044
Foot and ankle	−0.03	−0.003	0.002	0.797
Hand and upper extremity	−0.09	−0.002	0.0007	0.26
Shoulder	−0.03	−0.003	0.002	0.797
Spine	0.69	0.0048	0.009	< 0.001
Sports	−0.09	−0.003	0.0009	0.321
Pediatrics	−0.17	−0.012	0.0082	0.738
Trauma	0.45	0.0029	0.0061	< 0.001
Oncology	0.34	0.0017	0.0051	< 0.001
R-square	0.075

N = 30,129; CCI = Charlson Comorbidity Index.