From: Perioperative patient safety indicators and hospital surgical volumes
 | PSI#4 | PSI#9 | PSI#13 | Postoperative death | ||||
---|---|---|---|---|---|---|---|---|
 | R2 | p value | R2 | p value | R2 | p value | R2 | p value |
 | 0.365 | p < 0.01 | 0.129 | p < 0.01 | 0.111 | p < 0.01 | 0.406 | p < 0.01 |
Valuables | Coefficient | p value | Coefficient | p value | Coefficient | p value | Coefficient | p value |
Intercept |  | n.s. |  | p < 0.01 |  | n.s. |  | p < 0.05 |
Age | 0.374 | p < 0.01 | -0.229 | p < 0.01 | 0.018 | n.s. | 0.183 | p < 0.01 |
Charlson comorbidity index | 0.160 | p < 0.01 | 0.116 | n.s. | 0.106 | n.s. | 0.285 | p < 0.01 |
Difficulty of surgery | -0.233 | p < 0.01 | -0.152 | p < 0.05 | 0.016 | n.s. | -0.437 | p < 0.01 |
Surgical volume | -0.191 | p < 0.01 | 0.168 | p < 0.05 | 0.314 | p < 0.01 | -0.065 | n.s. |