Same Surgeon: Different Centre Equals Differing Lymph Node Harvest following Colorectal Cancer Resection

Table 1

Case mix between units.

		Unit 1	Unit 2	𝑋^2
		Percentage of total cases	Percentage of total cases	𝑃 value
Tumour location	Right colon*	35%	40%	𝑃=.427
		(38/110)	(41/103)
	Left colon**	20%	25%	𝑃=.360
		(22/110)	(26/103)
	Rectum	45%	35%	𝑃=.153
		(49/110)	(36/103)
	Panproctocolectomy	1%	0%	NA
		(1/110)
Median patient age		72	71	𝑃=.789
Operative urgency	Elective	86%	90%	𝑃=.373
		(95/110)	(94/103)
	Emergency	14%	10%
		(15/110)	(10/103)
T stage***	1 & 2	21%	20%	𝑃=.857
		(19/89)	(17/84)
	3 & 4	79%	79%
		(71/89)	(67/84)

*Right colon includes right hemicolectomy, extended right hemicolectomy, subtotal colectomy, and transverse colectomy. **Left colon includes left hemicolectomy, sigmoid colectomy, and Hartmann’s procedure for colonic tumours and high anterior resection for colonic/rectosigmoid tumours. ***Rectums with preoperative radiotherapy excluded.