Clark 2010.

Study characteristics
Methods	Study design Parallel RCT Duration of study Not reported Duration of follow‐up 7 months
Participants	General information Setting: not reported Country: USA Inclusion criteria: serum phosphorus levels of ≥ 6.5 for ≥ 3 consecutive months Exclusion criteria: not reported Baseline characteristics Number: intervention group (6); control group (6) Mean age ± SD (years): not reported Sex (M/F): not reported Stage of CKD: ESKD on dialysis
Interventions	Intervention type Self‐management: individual versus control Intervention group Met with the study physician monthly for 3 months with a review of food diaries, binder use and compliance, proper diet choices and descriptions of potential vascular complications (in addition to the standard dietician visit) Control group Met with the dietician monthly with a review of labs and diet Co‐interventions Both groups were also seen monthly by their nephrologists
Outcomes	Bloods PO4, Ca x PO4 product
Notes	Conflict of interest Not reported Funding source Not reported Other information Abstract‐only publication
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	High risk	Unclear whether personnel were blinded. Participants could not of been blinded
Blinding of outcome assessment (detection bias) Objective outcomes	Low risk	Probably not blinded but objective outcome measures
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Insufficient information; does not seem to be any dropouts but a very small sample size
Selective reporting (reporting bias)	Unclear risk	Unclear
Other bias	High risk	No mention of whether control and intervention were significantly different. Small sample size. Was the intensive study physician trained in nutrition education?