Risk Balancing of Cold Ischemic Time against Night Shift Surgery Possibly Reduces Rates of Reoperation and Perioperative Graft Loss

Table 2

Proportions of teaching operations and distribution of the cumulative sum (CUSUM) of the 1st surgeons’ kidney transplantations over the 3 h time intervals. Shown are the distribution of teaching operations and the distribution of the cumulative sum (CUSUM) of the 1st surgeons’ kidney transplantations over the 3 h time intervals. There was no significant difference in distribution of CUSUM between the 3-hour intervals (Levene’s test, )   (Supplemental Figure b). The proportion of teaching operations was unequally distributed between the 9 PM and 12 AM time interval and the two time intervals of 6 AM–9 AM and 9 AM–12 PM, with a significant higher proportion of teaching operations during the morning shift hours between 6 AM and 12 PM (Chi² test ) (Supplemental Figure a). The proportion of teaching operations within the 3 AM–6 AM interval was not significantly different compared to all other 3-hour intervals (Chi² test ).

3 h time interval	Teaching operation				CUSUM
	Expected ()	Counted ()	%	95% CI	Mean	Max	Min	Med	SD
12 AM–3 AM ()	65	62	65	54.16; 74.08	54.5	345	1	37.5	52.3
3 AM–6 AM ()	17	17	68	46.50; 85.05	56.8	235	4	39.0	52.0
6 AM–9 AM ()	90	103	77	68.80; 83.71	52.9	341	1	29.5	60.1
9 AM–12 PM ()	180	194	73	66.89; 77.91	45.0	330	1	29.0	55.5
12 PM–3 PM ()	185	191	70	63.89; 75.09	39.6	361	1	22.0	51.9
3 PM–6 PM ()	114	112	66	58.61; 73.35	39.7	350	1	26.0	46.5
6 PM–9 PM ()	106	96	61	53.05; 68.81	49.8	347	1	33.0	51.9
9 PM–12 AM ()	94	76	54	45.66; 62.72	50.9	346	1	38.0	54.5