Table 5.

Multivariable linear regression coefficients for the association of ACT^a and SCT^b with anesthesia, hospital, and surgeon.

Outcome and variable		Total hip arthroplastyc				Total knee arthroplastyd
		Estimates (min)	95% CI	P value	Estimates (min)		95% CI	P value
ACT
	Coefficient intercept	22.15	19.29 to 25.01	<.001	19.35		16.91 to 21.78	<.001
	Neuraxial anesthesia	1.38	–0.71 to 3.47	.92	1.75		–0.21 to 3.70	.11
	AMCe	4.08	2.08 to 6.07	<.001	3.83		2.21 to 5.64	<.001
	Surgeon 1	–2.12	–3.92 to –0.32	.02	–1.56		–3.05 to –0.07	.04
SCT
	Coefficient intercept	105.56	98.01 to 113.11	<.001	103.01		94.93 to 111.20	<.001
	Neuraxial anesthesia	–1.18	–6.71 to 4.35	.68	–0.53		–7.09 to 6.03	.87
	AMC	10.88	5.62 to 16.15	<.001	13.93		8.17 to 19.70	<.001
	Surgeon 1	–3.17	–7.93 to 1.59	.19	–10.34		–15.34 to –5.35	<.001

^aACT: anesthesia-controlled time.

^bSCT: surgery-controlled time.

^cACT for total hip arthroplasty had 609 observations and an R²/R² adjusted value of 0.036/0.031; and total knee arthroplasty had 625 observations and an R²/R² adjusted value of 0.037/0.033.

^dSCT for total hip arthroplasty had 609 observations and an R²/R² adjusted value of 0.033/0.028; and total knee arthroplasty had 625 observations and an R²/R² adjusted value of 0.058/0.054.

^eAMC: academic medical center.