Marco Boonstra

61 SUPPLEMENTARY FILES Supplemental Table 1a-1c: Search strategies S1 “Kidney Failure, Chronic”[Mesh] OR “Renal Insufficiency, Chronic”[Mesh] OR “Kidney Transplantation”[Mesh] OR “Renal Dialysis”[Mesh] OR chronic kidney[tiab] OR ckd[tiab] OR chronic renal[tiab] OR kidney transplant[tiab] OR renal transplant[tiab] OR dialysis[tiab] - 314132 S2 “Health Literacy”[Mesh] OR literacy[tiab] OR illiterate[tiab] OR illiteracy[tiab] OR literate[tiab] OR numeracy[tiab] OR TOFHLA[tiab]”Health Literacy”[Mesh] OR literacy[tiab] OR illiterate[tiab] OR illiteracy[tiab] OR literate[tiab] OR numeracy[tiab] OR TOFHLA[tiab] - 23876 S3 S1 AND S2 - 259 S1 TS=(literacy OR illiterate OR illiteracy OR literate OR numeracy OR TOFHLA) - 61467 S2 TS=(“chronic kidney” OR ckd OR “chronic renal” OR “kidney transplant” OR “renal transplant” OR dialysis) - 232052 S3 S1 AND S2 - 317 S1 S1: (((((((((((chronic AND (‘kidney’ OR ‘kidney’/exp OR kidney) AND (‘failure’ OR ‘failure’/ exp OR failure) OR chronic) AND (‘kidney’ OR ‘kidney’/exp OR kidney) AND (‘failure’ OR ‘failure’/exp OR failure) OR renal) AND insufficiency AND chronic OR renal) AND insufficiency AND chronic OR ‘kidney’ OR ‘kidney’/exp OR kidney) AND (‘transplant’ OR ‘transplant’/exp OR transplant) OR ‘kidney’ OR ‘kidney’/exp OR kidney) AND (‘transplant’ OR ‘transplant’/exp OR transplant) OR renal) AND (‘dialysis’ OR ‘dialysis’/exp OR dialysis) OR renal) AND (‘dialysis’ OR ‘dialysis’/exp OR dialysis) OR chronic) AND kidney:ab,ti OR ckd:ab,ti OR chronic) AND renal:ab,ti OR ‘kidney’ OR ‘kidney’/exp OR kidney) AND transplant:ab,ti OR renal) AND transplant:ab,ti OR dialysis:ab,ti - 229419 S2 S2: ‘health literacy’ OR literacy:ab,ti OR illiterate:ab,ti OR illiteracy:ab,ti OR literate:ab,ti OR numeracy:ab,ti OR tofhla:ab,ti - 29283 S3 S1 AND S2 - 282 Inclusion criteria Exclusion criteria Studies: • Included (a cohort of) any stage CKD patients ≥18 and/or health care professionals. • Assessed HL using a validated HL screener or questionnaire. • Gave results on associations of LHL with potential mediating factors, derived from the Pathway of Paasche-Orlow or provided information on the development and testing of interventions explicitly customized to CKD and the needs of LHL patients. • Were original, peer-reviewed quantitative, qualitative and intervention studies in English, German or French. Studies • Only included patients <18 or with cognitive problems. • Only gave results about associations of HL with knowledge or HL with clinical health outcomes. • Described the development or validation of HL screeners or questionnaires, but without outcomes on factors potentially explaining worse health outcomes. • Used educational level (e. g. years at school) as measurement for HL. • Were incomplete or other study type: for example systematic reviews, congress abstracts, letters, descriptions. Supplemental Table 1a Search strategy for PubMed Supplemental Table 1b Search strategy for Web of Science Supplemental Table 1c Search strategy for Embase Supplemental Table 2: Inclusion and exclusion criteria

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