SUBLIME 2016.

Methods	Study design: parallel RCT Study duration: 3 month intervention, 6 month maintenance phase Study follow‐up: 9 months
Participants	Country: Netherlands Setting: outpatients Patients with eGFR > 25mL/min with CKD or kidney transplant recipient; diagnosed with hypertension, sodium intake > 130mmol/day Number: 99, numbers per group not reported Mean age ± SD: 57 ± 12 years Sex: not reported Exclusion criteria: not reported
Interventions	Intervention type classification: behavioural counselling eHealth intervention used: website, internet Intervention group Web‐based self‐management system Dedicated to dietary sodium restriction with individual e‐coaching Two group meetings in 3‐month intervention phase, followed by 6‐month maintenance phase Control group Not described
Outcomes	Outcomes measured at baseline, 3, 6, 9 months BP electrolytes dietary sodium intake (measured using 24 urine collection) QoL and well being Healthcare expenditure from questionnaires Incremental cost‐effectiveness ratio
Notes	Abstract‐only publication Funding source: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Study described as randomised, method of random sequence generation not reported
Allocation concealment (selection bias)	Unclear risk	Insufficient information to permit judgement
Blinding of participants and personnel (performance bias) Blinding of participants	High risk	Could not have been blinded
Blinding of participants and personnel (performance bias) Blinding of personnel	Unclear risk	Insufficient information to permit judgement
Blinding of outcome assessment (detection bias) Objective outcome	Low risk	Objective data such as BP, 24‐hour urine sodium, cost‐analysis
Blinding of outcome assessment (detection bias) Subjective outcomes	Unclear risk	No reporting of how well being and quality of life is measured
Incomplete outcome data (attrition bias) All outcomes	High risk	28% drop out in intervention, 3.3% drop out in control ‐ no mention if these participants differed; no mention of whether used ITT analyses
Selective reporting (reporting bias)	High risk	Insufficient information to permit judgement
Other bias	Unclear risk	Insufficient information to permit judgement