Table 1.

Patient and procedure characteristics at primary TKA relative to the four procedure duration groups

	Procedure Duration Groups
	< 75 min	75 – 89	90 – 109	≥110	p-value
Number of procedures	5680	6238	8659	7685
Year of operation 2010-2014 (n = 15,900) %	60	58	57	52	P < 0.001
Male sex (n = 10,186) %	28	31	37	44	P < 0.001
Age group %					P < 0.001
<60 (n = 4989)	15	17	17	21
60-69 (n = 9717)	33	34	34	36
70-79 (n = 10,009)	38	36	36	32
≥80 (n = 3547)	14	13	13	11
Median age (years) (range)	71 (31-96)	70 (25-94)	70 (23-101)	68 (22-93)
Median annual hospital volume	118	113	95	86	P < 0.001
ASA %					P = 0.001
1 (n = 4167)	16	14	14	16
2 (n = 17,918)	64	65	64	62
3+ (n = 5621)	19	19	20	21
Osteoarthritis (n = 25,152) %	92	90	88	87	P < 0.001
Perioperative complications (n = 640) %	0.7	1.1	1.8	4.9	P < 0.001
Previous surgery for intraarticular fracture or fracture near the joint (n = 551) %	0.8	1.3	1.7	3.6	P < 0.001
Previous high tibial osteotomy (n = 885) %	1.9	2.5	2.8	4.9	P < 0.001
Computer navigated TKA (n = 2462) %	2.5	5.6	9.0	18	P < 0.001
Systemic antibiotics (n = 28,108) %	100	100	100	100	P = 0.4
Prosthesis brand %					P < 0.01
LCS Complete (n = 8752)	26	31	31	34
Profix (n = 6286)	23	24	23	20
NexGen (n = 4717)	18	16	16	17
AGC (n = 2233)	15	7.3	6.1	5.1
Duracon (n = 2043)	5.7	6.8	6.8	9.2
Triathlon (n = 1317)	5.2	4.0	5.2	4.1
Vanguard (n = 741)	1.5	1.7	3.7	3.0
PFC-Sigma (n = 697)	1.3	2.6	3.0	2.7
LCS (n = 516)	1.3	1.2	2.0	2.5
Other (n = 955)	3.3	5.0	2.9	2.7