Rubin 2012.

Methods	A prospective study of UC patients measuring the correlation between endoscopic, clinical and histologic measurement tools
Data	86 UC patients undergoing standard colonoscopy or sigmoidoscopy Static endoscopic images and corresponding biopsies of the mucosa of the distal colon were obtained
Comparisons	SCCAI (clinical) Rubin Histologic Score
Outcomes	Construct validity (see Table 5)
Notes	Endoscopic index evaluated: Mayo Clinic Endoscopic Subscore Study published in abstract form only
Risk of bias
Item	Authors' judgement	Description
Blinding?	Unclear	Unlcear whether the endoscopist and histologist who performed scoring were blinded to patient information
Independent Observation?	Unclear	Not adequately described