Percentages of deaths after 30 days from a surgical procedure and of unplanned returns to theatre for all non-emergency surgical patients stratified by quarter during 2015
| Period | 30 days mortality after surgeries | ||||
| N°, of operated patients | % | RR | 95% CI | p value | |
| First quarter 2015 | 2506 | 1.64 | – | – | – |
| Second quarter 2015 | 2469 | 2.19 | 1.34 | 0.88 to 2.04 | n.s. |
| Third quarter 2015 | 2322 | 2.02 | 1.24 | 0.80 to 1.91 | n.s. |
| Fourth quarter 2015 | 2457 | 2.20 | 1.24 | 0.80 to 1.91 | n.s. |