Walkiewicz 2011.

Study characteristics
Methods	Study design: prospective RCT Study duration: NR Setting: IBD clinic
Participants	State of disease at beginning of study per IG/CG: NR Disease type per IG/CG: IBD (UC and CD) Specific figures NR in abstract Inclusion criteria: NR Exclusion: NR Age at beginning of study per IG/CG: age range 11‐21 years Sex per IG/CG: NR Disease duration per IC/CG: NR Number randomised per IG/CG: total randomised 36 Number reaching end of study per IG/CG: NR
Interventions	IG: IG1: "Internet blog access" IG2: "the receipt of text messaging" IG3: "combination of Internet blog access and text messaging" CG: standard care
Outcomes	Duration of follow‐up: 3 months Primary outcomes as defined by study authors: disease‐related knowledge assessed using a modified version of the Crohn's and Colitis Foundation of America (CCFA) Knowledge Score (I‐M‐AWARE) Secondary outcomes as defined by study authors: NR
Notes	Funding source: NR Conflicts of interest: NR
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Only the abstract was available as contact person for the study said he no longer has access to the study.
Allocation concealment (selection bias)	Unclear risk	No information (abstract only and author responded they have no access to the study data anymore)
Blinding of participants and personnel (performance bias) All outcomes	High risk	It is not possible to blind the participants to the intervention
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No information (abstract only and author responded they have no access to the study data anymore)
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No information (abstract only and author responded they have no access to the study data anymore)
Selective reporting (reporting bias)	Unclear risk	Results presented in the abstract are reflective of the outcomes mentioned in the method section but the data is not clearly presented per group
Other bias	Unclear risk	No information on baseline characteristics (abstract only and author responded they have no access to the study data anymore). No other concerns.