Wang KF 1993.

Methods	Generation of allocation sequence: unstated. Blinding: not used. Sample size estimation: no information. Withdrawal/drop‐out: unstated.
Participants	Ethnic: Chinese; 32 patients (mean age 54 years (46‐70), mean disease duration 3.5 years (0.5‐8 years). Among them, 7 complicated with coronary heart disease, 8 with retinal disease, 4 with peripheral neuropathy, 2 with diabetic nephropathy. 20 in treatment group, M/F 8/12; 12 in control group, M/F 4/8). Setting: unstated. Inclusion criteria: type 2 diabetes mellitus, diagnosed by WHO criteria. Exclusion criteria: unstated.
Interventions	Experimental intervention: Shuizhi Sanhuang Tang (mixture of 9 herbs) decoction, one dosage daily, for three months. Control intervention: glibenclamide, no details for regimen, for three months.
Outcomes	Symptoms and FBG. No follow‐up was reported.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear