Burger 2011.

Methods	Consectuive patients were assessed by 4 gastroenterologists using clinical and endoscopic scoring indices Histologic activity was scored by 2 pathologists Fleiss' ƙ was used to evaluate interobserver variation
Data	Number of patients: 91 Number of readers: 4/2
Comparisons	SCCAI (clinical) Truelove and Richards Index (histologic)
Outcomes	Construct validity (see Table 5)
Notes	Endoscopic scoring index validated: the Baron Score Study published in abstract form only; methods indicates interobserver variation study, but only construct validity is reported
Risk of bias
Item	Authors' judgement	Description
Blinding?	Unclear	Not adequately described
Independent Observation?	Yes	4 gastroenterologists scored sigmoidoscopy videos of consecutive patients independently (although the rates of interrater agreement were not reported)