TABLE 2.

Local incidence of major postoperative complications. Intervention (After) and control (Before) groups are shown, split based on study site. Odds ratio, 95% confidence intervals and P-values obtained via Pearson’s χ² test for the entire control and intervention groups are presented

Site	30-day mortality (%)		Blood loss over 1000 mL (%)		Reoperation (%)		Surgical infection (%)		Other (%)		Any complication (%)
	Before	After	Before	After	Before	After	Before	After	Before	After	Before	After
1	1.1	0	0	0.6	3.4	0	2.3	0.6	2.3	0	9.2	1.3
2	2.1	0	2.1	0	0.6	0	2.1	0	0	1.4	7.1	1.4
3	1.2	0.6	1.9	0.6	1.9	0.6	1.2	1.2	0.6	0.6	6.9	3.7
4	1.0	0.2	0.5	0.5	1.2	0.5	1.4	0.2	1.4	0.7	7.1	2.2
5	1.2	0	1.2	0	1.2	0	2.5	0	2.5	4.5	8.8	4.5
6	0.8	1.2	0.8	0	1.6	0.8	0.8	0.4	1.6	0.8	5.7	3.2
Total	1.3	0.3	0.9	0.4	1.7	0.5	1.5	0.1	1.4	0.8	6.9	2.4
OR [95% CI] P-value	0.4 [0.1–0.9] 0.03		0.5 [0.2–1.5] 0.1		0.3 [0.1–0.8] 0.01		0.3 [0.1–0.8] 0.01		0.6 [0.2–1.4] 0.2		0.3 [0.2–0.5] < 0.001