| Methods |
The method of allocation is not stated. No mention of blinding of outcome assessments. |
| Participants |
193 women presenting with incomplete miscarriage in a hospital in Singapore.
Exclusion criteria: women with missed miscarriage. |
| Interventions |
Treatment with electric pump vacuum aspiration using metal cannulae 9 mm to 16 mm in diameter, versus sharp metal curettage. |
| Outcomes |
Failure rate/need for re‐evacuation (macroscopic and histologic evidence of retained products), any complications e.g. perforated uterus. |
| Notes |
No mention was made of women excluded from analyses after randomization.
No mention was made of prophylactic antibiotic use.
No mention was made of anesthesia/analgesia use.
Cases were followed up at 2‐week intervals on 2 or more occasions to evaluate for complications. |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Adequate sequence generation? |
Unclear risk |
Reported as "being allocated to each group at random".
No randomization method was described. |
| Allocation concealment? |
Unclear risk |
No allocation concealment method was described. |
| Blinding?
All outcomes |
Unclear risk |
Participants were not blinded. No information was provided on the blinding of the assessors. |
| Incomplete outcome data addressed?
All outcomes |
Low risk |
No loss to follow up occurred based on the numbers provided in the text. |
| Free of selective reporting? |
Low risk |
The study protocol is not available but it is clear that the published reports include all expected outcomes, including those that were pre‐specified. |
| Free of other bias? |
Unclear risk |
There is insufficient information to assess whether an important risk of bias exists. |
