Table. Perioperative Parameters by Study Period.
| Clinical parameter | % | P valuea | ||
|---|---|---|---|---|
| Period 1, 2001-2007 (n = 203) | Period 2, 2008-2012 (n = 426) | Period 3, 2013-2017 (n = 433) | ||
| Operating room time, mean (SD), min | 213 (95) | 195 (87) | 139 (62) | <.001 |
| Transfusions | 10 (4.9) | 20 (4.7) | 4 (0.9) | .001 |
| Purely laparoscopic operations | 91 (44.8) | 290 (68.1) | 302 (69.7) | <.001 |
| Complications | <.001 | |||
| Conversion to open technique | 31 (15.2) | 23 (5.4) | 23 (5.3) | .82 |
| Background cirrhosis | 5 (2.4) | 10 (2.3) | 12 (2.7) | .002 |
| Laparoscopic cases among all liver resections, No./total No. (%) | 203/727 (27.9) | 426/1263 (33.7) | 433/1371 (31.6) | .01 |
a
Period 1 vs period 2 or 3.