Table VI.

Estimated economic impact of trainee and advanced practice staff on operative efficiency during arthroplasty.

	THA			TKA
Presence of	Median room time, mins (IQR)	Median cost, $ (IQR)	Difference in cost per case, $	Median room time, mins (IQR)	Median cost, $ (IQR)	Difference in cost per case, $
Surgical fellows *
No	168 (152 to 193.5)	13,020.00 (11,780.00 to 14996.25)	N/A	N/A	N/A	N/A
Yes	165 (141.5 to 179)	12,787.50 (10,966.25 to 13,872.50)	232.50	N/A	N/A	N/A
Medical students
No	168 (154 to 194)	13,020.00 (11,935.00 to 15,035.00)	N/A	166 (151 to 178)	12,865.00 (11,702.50, to 13,795.00)	N/A
Yes	167 (149 to 177)	12,942.50 (11,547.50 to 13,717.50)	77.50	156 (146 to 190)	12,090.00 (11,315.00 to 14,725.00)	775.00
Nursing students
No	168 (157 to 188)	13,020.00 (12,167.50 to 14,570.00)	N/A	157 (146 to 174)	12,167.50 (11,315.00 to 13,485.00)	N/A
Yes	165 (140.5 to 193.5)	12,787.50 (10,888.75 to 14,996.25)	232.50	168 (156 to 191)	13,020.00 (12,090.00 to 14,802.50)	852.50
Any students
No	168 (157.5 to 190.5)	13,020.00 (12,206.25 to 14,841.25)	N/A	162 (154 to 178.5)	12,555.00 (11,935.00 to 13,833.75)	N/A
Yes	167.5 (145.5 to 191.5)	12,981.25 (11,276.25 to 14,841.25)	38.75	161.5 (145.25 to 186)	12,516.25 (11,256.86 to 14,415.00)	38.75
Physician assistants *
No	168 (147 to 188.5)	13,020.00 (11,392.50 to 14,608.75)	N/A	N/A	N/A	N/A
Yes	168 (157 to 192.5)	13,020.00 (12,167.50 to 14,918.75)	0.00	N/A	N/A	N/A

^*Not analyzed for TKA due to insufficient cohort size.

IQR, interquartile range; N/A, not applicable; THA, total hip arthroplasty; TKA, total knee arthroplasty.