Ou L 2011.

Methods	Country: China Setting: hospital based Aim: to study the effects of Radix rehmanniae preparata, Radix astragali, etc. in the treatment of postmenopausal osteoporosis Study design: randomised controlled trial Analysis: T‐test Loss to follow‐up: not reported
Participants	Ethnicity: Chinese 64 postmenopausal osteoporosis patients enrolled: 32 in trial group, 32 in control group Inclusion criteria: Chinese and WHO diagnostic criteria for osteoporosis Exclusion criteria: not mentioned
Interventions	Experimental: Radix rehmanniae preparata, Radix astragali, etc. (1 dose per day), for 6 months Control:calcium carbonate tablets (600 mg per day, once a day), for 6 months
Outcomes	BMD, E2, ALP, Ca, P, PTH, CT
Notes	The study was supported by Shanxi Provincial Department of Education project, but no declarations of interest for the primary researchers reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation	Unclear risk	No information provided
Allocation concealment	Unclear risk	No information provided
Blinding All outcomes	Unclear risk	Insufficient information to permit judgement of 'low risk' or 'high risk'
Incomplete outcome data addressed All outcomes	Low risk	No missing outcome data
Free of selective reporting	Unclear risk	Not all the outcomes that were of interest in this review were reported
Free of other bias	Low risk	The study appears to be free of other sources of bias