Is the traditional Chinese medicine helpful for patients with hematologic malignant diseases? A meta-analysis of randomized controlled trials

Table 4 Risk assessment of Dian Rong 2009 study

Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: Central randomized
		Comment: Probably done. Several studies published by this research group reported reliable randomization method
Allocation concealment (selection bias)	Unclear	Quote: Not mentioned
		Comment: Unclear
Blinding of participants and personnel (performance bias)	Low risk	Quote: A double-blind and placebo controlled
All outcomes		Comment: Probably done. Several studies published by this research group reported reliable method to warrant the double blindness
Blinding of outcome assessment (detection bias)	Low risk	Quote: Not mentioned
All outcomes		Comment: Mortality and survival time are objective parameter. Subjective judgement can not influent the result
Incomplete outcome data (attrition bias)	Unclear	Quote: Not mentioned
All outcomes		Comment: Unclear
Selective reporting (reporting bias)	Low risk	The primary outcome listed in the method section are all reported
		Comment: Probably done
Other bias	Unclear	The study did not use the intention to treat strategy to analyze the result