Table II.

Patients characteristics by arthroplasty type (primary diagnosis of osteoarthritis).

Characteristic	THA	TKA
Total, n	5,228	8,299
Mean age, yrs (SD)	66.8 (10.6)	67.5 (8.8)
Female, n (%)	2,850 (54.5)	4,684 (56.4)
Mean BMI, kg/m2 (SD)	29.9 (7.7)	32.5 (7.0)
ASA grade, n (%)
1	402 (7.7)	383 (4.6)
2	2,927 (56.1)	4,443 (53.7)
3	1,834 (35.1)	3,379 (40.8)
4	58 (1.1)	76 (0.9)

ASA, American Society of Anesthesiologists; SD, standard deviation; THA, total hip arthroplasty; TKA, total knee athroplasty.