Tzvetanov 2015.

Study characteristics
Methods	Study design: pilot RCT Recruitment: enrolment start and finish date not reported Study duration:12 months
Participants	Country: USA Setting: not reported Inclusion criteria: not reported Number: intervention group (4); control group (2) Mean age ± SD (years): intervention group (45 ± 6.50; control group (42.5 ± 4.5) Sex (M/F): not reported Baseline characteristics Nationality: not reported Ethnicity: not reported Mean baseline BMI ± SD (kg/m²): intervention group (39.9 ± 1.4); control group (40.5 ± 0.2) Stage of CKD: post kidney transplant Mean baseline eGFR ± SD (mL/min/1.73 m²): not reported Mean baseline SBP ± SD (mmHg): not reported Mean baseline DBP ± SD (mmHg): not reported Mean baseline energy intake ± SD (kcal/day): not reported Comorbid conditions: not reported Exclusion criteria: not reported
Interventions	Intervention type classification: mixed (bariatric surgery + lifestyle) Weight loss intervention/s used: sleeve gastrectomy compared to standard care weight loss program Intervention group Simultaneous robotic kidney transplant and sleeve gastrectomy. No further information provided on the intervention, who delivered the intervention or how often care or treatment was received post surgery Comparator group Received standard weight loss program after a robotic kidney transplant. Not reported what the intervention consisted of and who delivered the intervention or how often care or treatment was received Co‐interventions Nil reported
Outcomes	BMI (kg/m²) Adverse patient outcomes associated with each weight loss intervention
Notes	Founding source: not reported Trial registration: not reported Possible conflicts of interest for study author: not declared (no statement provided) Abstract only. Preliminary results only
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Insufficient information to permit judgement
Allocation concealment (selection bias)	Unclear risk	Insufficient information to permit judgement
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Insufficient information to permit judgement
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Insufficient information to permit judgement
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Insufficient information to permit judgement
Selective reporting (reporting bias)	Unclear risk	Insufficient information to permit judgement
Other bias	Unclear risk	Insufficient information to permit judgement