Zhang FB 2003.

Methods	Generation of allocation sequence: unstated. Blinding: not used. Sample size estimation: no information. Withdrawal/drop‐out: unstated.
Participants	Ethnic: Chinese; 50 patients (34 in treatment group, mean age 62.6 years (37‐71), disease duration 6 months to 25 years; 16 in control group, mean age 63.2 years (37‐71), disease duration 6 months to 24 years). Gender was not reported. Setting: outpatients. Inclusion criteria: type 2 diabetes mellitus, diagnosed by ADA criteria (1997). Exclusion criteria: unstated.
Interventions	Experimental intervention: Yiqi Yangyin Bushen recipe (mixture of 10 herbs) decoction, one dosage daily, divided into two times orally; glibenclazide, 10 mg daily, plus metformin, 0.5 mg t.i.d., orally; for 60 days. Control intervention: glibenclazide, 10 mg daily, plus metformin 0.5 mg, t.i.d., orally, for 60 days.
Outcomes	FBG, PBG, and HbA1c. No follow‐up was reported.
Notes	There was a skew distribution of numbers of patients in 2 groups. The author did not explain for this.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear