Wang 2010.

Methods	This study was a randomised, double‐blind placebo‐controlled trial using a between‐subject design with a randomisation ratio of 1:1.04:0.91:0.91
Participants	INCLUSION CRITERIA: 18 to 55 years old BMI 24 to 35 kg/m2 body fat > 25% for males and > 30% for females waist circumference > 85 cm for males and > 80 cm for females normal liver function (assessed by plasma enzyme profile and total bilirubin levels) low caffeine consumption (< 200 mg/day) low tea consumption (< 2 tea bags/day or < 4 g loose tea/day) non‐smoking zero or moderate (< 14/week for women and < 21/week for men) alcohol consumption EXCLUSION CRITERIA: use of any medication, except over‐the‐counter and oral contraceptives suffering from any medical or psychiatric condition actively following a weight loss regimen or a medically prescribed dietary regimen change in body weight  > 2 kg in 3 months before start of trial DIAGNOSTIC CRITERIA: body fat % (measured with a QDR4500W Dexa (fan beam) (Hologic, Waltham, MA)) body weight waist circumference hip circumference
Interventions	NUMBER OF STUDY CENTRES: 1 COUNTRY/ LOCATION: China/Shanghai SETTING: study centre TREATMENT BEFORE STUDY: note: run‐in period of 2 weeks where participants drank 1 serving of control tea at study site to test adherence and protocol compliance
Outcomes	OUTCOME(S) (as stated in the protocol/registered trial documents): PRIMARY OUTCOME(S): unknown SECONDARY OUTCOME(S): unknown OTHER OUTCOME(S): unknown
Study details	STUDY TERMINATED BEFORE REGULAR END: no
Publication details	This study was published in English in Obesity, a peer‐reviewed journal, and was supported by the Lipton Institute of Tea; all authors but 1 were employees of Unilever
Stated aim of study	Quote from study: "in this large, double‐blind placebo‐controlled trial we investigated the effects of consuming GT [green tea] with different amounts of catechins on measures of body weight, total body fat mass and the distribution of fat between abdominal and other depots"
Notes	BMI: body mass index
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote from study: "subjects were randomly allocated to one of four groups. Randomization of subjects into experimental groups was based on stratification by BMI, waist circumference/height, and gender" Comment: Method of randomisation not reported.
Allocation concealment (selection bias)	Unclear risk	Comment: not reported
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Quote from study: "to ensure that subjects would not know they were consuming a control treatment, a small amount of unextracted green leaf (0.5 g) and tea power perfume were added" Comment: No mention of whether investigators were blinded as well. No mention of effectiveness of blinding efforts
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Comment: all outcomes on which the study reported were objective and measured by assessors. Therefore, whether or not assessors were blinded, risk of detection bias was assessed as low
Incomplete outcome data (attrition bias) All outcomes	Low risk	Comment: authors adequately accounted for attrition
Selective reporting (reporting bias)	Low risk	Comment: outcomes specified at the beginning were adequately investigated and reported
Other bias	Unclear risk	Comment: authors are employees of Unilever or Lipton; nature of corporate support for study is unclear