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. 2000 Oct 23;2000(4):CD001940. doi: 10.1002/14651858.CD001940

Yan 1988.

Methods Randomised double‐blind paired trial. 
 Generation of allocation sequence: unspecified. Allocation concealment: described as adequate. 
 Blinding: provider and patients. 
 Loss of follow‐up: none. 
 Jadad score=3.
Participants Ethnic: Chinese. 
 80 patients(54 males and 26 females; age: 17‐50 yrs). 
 Setting:inpatients. 
 Inclusion criteria: chronic hepatitis with HBsAg positive, diagnosis confirmed by liver biopsy; and no immune regulatory drugs were used for one year prior to the trial. 
 Exclusion during trial: unstated.
Interventions Experimental: 
 Polyporus umbellatus polysaccharide (extract of herb) injection, 40 mg, i.m., daily, over 20 days, rest for 10 days, repeating for three months. 
 Control: 
 Placebo (1/80 compound Salviae miltiorrhizae), with the same appearance, usage, dosage and treatment duration as the intervention drug.
Outcomes Symptoms and signs. Viral responses: HBsAg, HBeAg. ALT. 
 Histology of liver. 
 Adverse effects. 
 Follow‐up: three months.
Notes  
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment? Low risk A ‐ Adequate