Table 1.
Basic characteristics of the enrolled studies
| Year | Country | Design of study | No. of patients in LA group | No. of patients in OA group | Primary outcomes | |
|---|---|---|---|---|---|---|
| Guller | 2004 | USA | Retrospective | 1475 | 8001 | LOS, Postoperative complications |
| Harrell | 2006 | USA | Retrospective | 534 | 2188 | LOS, Postoperative complications |
| Wang | 2006 | Taiwan, China | Retrospective | 24 | 29 | Duration of surgery, LOS |
| Paranjape | 2007 | USA | Retrospective | 68 | 48 | Duration of surgery, LOS, Complications |
| Kim | 2011 | USA | Retrospective | 2235 | 1100 | LOS, complications |
| Wu | 2011 | Taiwan, China | Retrospective | 7.86 | 0.06 | Duration of surgery, LOS, Complications |
| Masoomi | 2012 | USA | Retrospective | 34,066 | 31,397 | LOS, Complications |
| Farrerese | 2013 | Italy | Retrospective | 19 | 20 | Duration of surgery, LOS, Complications |
| Moazzez | 2012 | USA | Retrospective | 2644 | 1030 | Duration of surgery, LOS, Complications |
| Ward | 2016 | USA | Retrospective | 87,209 | 170,276 | Duration of surgery, LOS, Complications |
| Wu | 2017 | China | Retrospective | 56 | 59 | Duration of surgery, LOS, Complications |
| Yang | 2017 | China | Retrospective | 80 | 65 | Duration of surgery, LOS, Complications |
abbreviation: LOS length of hospital stay