Table 1.
Characteristics of the included studies listed by the study quality and year
| Author, year | Type | Duration | Location | Patient (n) | Age, years | Bleeding definition | Risk factors | Quality score |
|---|---|---|---|---|---|---|---|---|
| Catanzarite, 2016 | Retrospective | 2005-2012 | USA | 1017 | NR | Transfusion requirement | Single (operative time) | 7 |
| Clark, 2017 | Retrospective | 2007-2012 | USA | 268 | NR | Intra-operative EBL | Single (menstrual cycle) | 6 |
| Saccardi, 2014 | Prospective | 2000-2012 | Italy | 444 | Mean 36.7±6.4 | Intra-operative EBL | Multiple | 6 |
| Walid, 2009 | Retrospective | 1999-2009 | USA | 41 | NR | Intra-operative EBL | Single (myoma size) | 6 |
| George, 2009 | Retrospective | 2005-2008 | USA | 77 | Median=37 (26-50) | Intra-operative EBL | Single (BMI) | 6 |
| Watrowski, 2017 | Retrospective | 2010-2015 | Germany | 150 | Median=37 (33-42) | Intra-operative EBL, pre- and postoperative Hb level | Multiple | 5 |
| Gingold, 2017 | Retrospective | 2011-2016 | USA | 140 | NR | Transfusion requirement within 1 week of surgery | Multiple | 5 |
| Cho, 2011 | Retrospective | 2008-2009 | South Korea | 167 | NR | Hb change more than 2 units | Multiple | 4 |
BMI: Body mass index, NR: Not reported, EBL: Estimated blood loss, Hb: Hemoglobin