Chart 3. Characteristics of the studies included.
| Author (year) | Country(ies) | Study design | Data collection period | Setting | Age (years), in mean (SD) or range | Number of women with PPH | Number of women with severe PPH | Sample size (n) | Quality assessment (NOS) |
| Sosa et al., 2009 | Argentina, Uruguay | Cohort | Data collected during 3 periods, but only 2 were used. First period: October to December 2003 Third period: October to December 2005 |
Hospital | NR | 1,221 | 309 | 11,323 | 8 |
| Richardson et al., 2017 | West Indies | Case-control | January 2007 to December 2009 | Hospital | 29.84 (6.1) | 50 | NE | 316 cases; 316 controls | 6 |
| Martin et al., 2003 | Antigua and Barbuda | Case-control | July 1991 to January 1997 | Hospital | 27.9 | 52 | NE | 157 cases; 157 controls | 6 |
| Firmin et al., 2019 | French Guiana | Case-control | September 2014 to September 2015 | Maternity Department of Hospital | NR | 154 | 39 | 154 cases; 308 controls | 8 |
| Kodan et al., 2020 | Suriname | Case-control | January to December 2017 | Hospital | 12–35 and > 35 | 585 | 216 | 8747 | 6 |
Abbreviations: PPH, postpartum hemorrhage; NOS, Newcastle-Otawa scale; NR, not reported; NE, not evaluated; SD, standard deviation.