Table 3.

Multivariable linear regression coefficients for the association of ACT^a and SCT^b with 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	23.47		21.42 to 25.51		<.001		21.03			19.47 to 22.58		<.001
	AMCe	3.77		1.83 to 5.71		<.001		3.58			1.91 to 5.26		<.001
	Surgeon 1	–2.18		–3.98 to –0.38		.02		–1.57			–3.06 to –0.08		.04
SCT
	Coefficient intercept	104.43		99.04 to 109.83		<.001		102.50			97.29 to 107.71		<.001
	AMC	11.14		6.02 to 16.26		<.001		14.04			8.43 to 19.65		<.001
	Surgeon 1	–3.12		–7.87 to 1.63		.20		–10.34			–15.33 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 0.033/0.030; and total knee arthroplasty had 625 observations and an R²/R² adjusted value of 0.033/0.029.

^dSCT for total hip arthroplasty had 609 observations and an R²/R² adjusted value of 0.032/0.029; and total knee arthroplasty had 625 observations and an R²/R² adjusted value of 0.058/0.055.

^eAMC: academic medical center.