Table 3.

Selected Parameter Estimates From Quantile Regression of Median of Total Cost (in Natural Log Scale)^*

	Anterior Cruciate Ligament Reconstruction		Cholecystectomy		Hernia Repair		Breast-Conserving Surgery
	Coeff (std err)	P	Coeff (std err)	P	Coeff (std err)	P	Coeff (std err)	P
No SSI (ref)
Non-serious SSI	0.280 (0.127)	0.028	0.198 (0.060)	0.001	0.300 (0.037)	<0.001	0.149 (0.035)	<0.001
Serious SSI	0.888 (0.039)	<0.001	0.977 (0.086)	<0.001	0.986 (0.052)	<0.001	0.293 (0.040)	<0.001
Female	0.054 (0.009)	<0.001	†		0.050 (0.007)	<0.001	‡
Congestive heart failure	0.186 (0.231)	0.423	0.331 (0.059)	<0.001	0.126 (0.059)	0.032	0.242 (0.133)	0.068
Depression	0.088 (0.036)	0.014	0.117 (0.015)	<0.001	0.202 (0.019)	<0.001	0.158 (0.020)	<0.001
Peripheral vascular disease	0.315 (0.111)	0.004	0.125 (0.029)	<0.001	0.179 (0.037)	<0.001	0.127 (0.079)	0.106
Previous Staphylococcus aureus infection	†		0.197 (0.068)	0.004	0.081 (0.106)	0.443	†
Psychoses	0.124 (0.037)	0.001	0.231 (0.016)	<0.001	0.224 (0.017)	<0.001	0.290 (0.022)	<0.001
Renal failure	0.122 (0.195)	0.531	0.154 (0.054)	0.004	0.249 (0.074)	0.001	†
Smoking ± medications	†		†		0.001 (0.010)	0.915	0.020 (0.015)	0.190
Smoking related diseases	†		0.132 (0.015)	<0.001	0.140 (0.019)	<0.001	0.150 (0.028)	<0.001
Outpatient hospital (ref)
Missing facility	−0.080 (0.012)	<0.001	0.055 (0.009)	<0.001	−0.046 (0.009)	<0.001	−0.100 (0.010)	<0.001
Inpatient hospital	0.121 (0.022)	<0.001	0.204 (0.007)	<0.001	0.254 (0.011)	<0.001	0.081 (0.014)	<0.001
Ambulatory surgery center	−0.199 (0.010)	<0.001	−0.252 (0.010)	<0.001	−0.384 (0.008)	<0.001	−0.228 (0.013)	<0.001
Laparoscopic cholecystectomy without acute cholecystitis (ref)
Laparoscopic cholecystectomy with acute cholecystitis			0.061 (0.006)	<0.001
Open cholecystectomy without acute cholecystitis			0.219 (0.079)	0.006
Open cholecystectomy with acute cholecystitis			0.455 (0.044)	<0.001
Conversion to open cholecystectomy without acute cholecystitis			0.348 (0.049)	<0.001
Conversion to open cholecystectomy with acute cholecystitis			0.423 (0.041)	<0.001
Inguinal/femoral hernia repair (ref)
Umbilical hernia repair					−0.020 (0.007)	0.006
Incisional/ventral hernia repair					0.280 (0.009)	<0.001
Laparoscopic hernia repair					0.297 (0.008)	<0.001
Benign breast disease (ref)
Carcinoma in situ							1.304 (0.021)	<0.001
Local breast cancer							1.681 (0.017)	<0.001
Regional breast cancer							2.042 (0.024)	<0.001
Metastatic cancer							1.868 (0.151)	<0.001
0 re-excisions within 90 days (ref)
1 re-excision within 90 days							0.317 (0.015)	<0.001
2+ re-excisions within 90 days							0.400 (0.038)	<0.001
Postoperative urinary tract infection or pneumonia	0.106 (0.076)	0.163	0.251 (0.024)	<0.001	0.268 (0.035)	<0.001	0.135 (0.031)	<0.001

^*Models were adjusted for all variables retained in the ordinary least squares regression model; only select parameters shown here.

^†Not included in the model because did not meet requirement for retention in ordinary least squares regression.

^‡Female not included because the BCS model was restricted to females.

Coeff indiates coefficient estimate; ref, reference group; std err, standard error; SSI, surgical site infection.