Clinical and Nonclinical Effects on Operative Duration: Evidence from a Database on Thoracic Surgery

Table 3

The regression results relevant to surgeons, surgery positions, and their interaction. The coefficients of other variables were not listed in the table since they were quite similar to those of model II.

Variables	Coefficient	95% confidential interval
Surgeon
Surgeon C	0.074	[0.031, 0.118]	0.001
Surgeon F	−0.269	[−0.359, −0.180]	<0.001
Surgery position
Position 3∼1	−0.155	[−0.217, −0.092]	<0.001
Position 3∼3	−0.085	[−0.146, −0.024]	0.007
Position 4∼1	−0.165	[−0.268, −0.061]	0.002
Position 4∼2	−0.102	[−0.211, 0.007]	0.067
Position 4∼4	−0.100	[−0.200, −0.001]	0.048
Position 5∼1	−0.422	[−0.755, -0.089]	0.013
Interactions
Surgeon B: position 2∼1	−0.141	[−0.218, −0.064]	<0.001
Surgeon B: position 2∼2	−0.141	[−0.221, −0.061]	0.001
Surgeon B: position 3∼2	−0.228	[−0.366, −0.091]	0.001
Surgeon B: position 3∼3	−0.171	[−0.319, −0.024]	0.023
Surgeon B: position 4∼3	−0.434	[−0.642, −0.225]	<0.001
Surgeon B: position 5∼5	−0.393	[−0.917, 0.131]	0.141
Surgeon C: position 3∼1	0.150	[0.010, 0.290]	0.036
Surgeon C: position 3∼2	−0.258	[−0.393, −0.123]	<0.001
Surgeon C: position 5∼4	−0.756	[−1.283, −0.229]	0.005
Surgeon D: position 5∼1	0.980	[0.169, 1.790]	0.018
Surgeon E: position 3∼2	−0.361	[−0.790, 0.068]	0.099
Surgeon E: position 3∼3	−0.428	[−0.766, −0.089]	0.013
Adjusted	0.222