Table 2.

Time trends (2011–2015) for OR and LR of postoperative complicated course, mortality and for LR also conversion rate

	Year of surgery					p for trend
	2011	2012	2013	2014	2015
Colon
Open resection, no. of patients	1723	1708	1297	1163	909	< 0.001
Complicated course	335 (19.4%)	301 (17.6%)	232 (17.9%)	205 (17.6%)	134 (14.7%)	0.009
Mortality	66 (3.8%)	69 (4%)	43 (3.3%)	38 (3.3%)	16 (1.8%)	0.006
Laparoscopic resection, no. of patients	2081	2569	2836	3931	4827	< 0.001
Complicated course	304 (14.6%)	326 (12.7%)	352 (12.4%)	467 (11.9%)	527 (10.9%)	< 0.001
Mortality	63 (3%)	48 (1.9%)	38 (1.3%)	52 (1.3%)	53 (1.1%)	< 0.001
Conversion, no. of patientsa	245 (11.8%)	273 (10.6%)	271 (9.6%)	441 (11.2%)	413 (8.6%)	< 0.001
Early conversion (≤ 30 min)	7.1%	8.0%	7.0%	7.5%	6%
Late conversion (> 30 min)	4.7%	2.6%	2.6%	3.8%	2.6%
% Early within conversion	60%	75%	73%	66%	70%	0.457
Rectum
Open resection, no. of patients	1053	901	574	429	293	< 0.001
Complicated course	280 (26.6%)	244 (27.1%)	146 (25.4%)	94 (21.9%)	63 (21.5%)	0.017
Mortality	39 (3.7%)	15 (1.7%)	13 (2.3%)	8 (1.9%)	5 (1.7%)	0.025
Laparoscopic resection, no. of patients	994	1334	1546	1929	2271	< 0.001
Complicated course	211 (21.2%)	261 (19.6%)	285 (18.4%)	380 (19.7%)	431 (19%)	0.28
Mortality	27 (2.7%)	21 (1.6%)	14 (0.9%)	19 (1%)	25 (1.1%)	0.001
Conversion, no. of patientsa	129 (13.0%)	156 (11.7%)	191 (12.4%)	185 (9.6%)	182 (8.0%)	< 0.001
Early conversion (≤ 30 min)	5.5%	6.7%	6.7%	5%	4%
Late conversion (> 30 min)	7.4%	5%	5.6%	4.6%	4.1%
% Early within conversion	43%	57%	54%	52%	49%	0.673

^aFor laparoscopic surgery also the conversion rates are shown, separated in early and late conversion