Cheng 2006.

Study characteristics
Methods	RCT
Participants	44 women with epithelial ovarian cancer achieved CCR Stage 3 and 4 Mean age was 53.8 years old in maintenance chemotherapy group and 53.7 in observation group Mean follow‐up time was 39.6 months in maintenance chemotherapy group and 33.2 months in observation group
Interventions	Platin + CTX/Taxel versus observation
Outcomes	Recurrence rate, disease‐free survival
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: " patients were randomly allocated" Comment: Probably done
Allocation concealment (selection bias)	Unclear risk	Insufficient information to permit judgement
Blinding (performance bias and detection bias) All outcomes	Low risk	No blinding, but the outcome and the outcome measurement are not likely to be influenced by lack of blinding.
Incomplete outcome data (attrition bias) All outcomes	Low risk	No missing outcome data
Selective reporting (reporting bias)	Low risk	All expected outcomes were reported
Other bias	Low risk	The study appears to be free of other sources of bias