Table 1 .

Study characteristics

Developer, region, year	Content	Scoring system
NICE, UK, 2020	E, D&T, FU	NICE system	Focus on diverticular disease
ESCP, Europe, 2020	E, D&T, FU	Oxford	Focus on diverticular disease
WSES, World, 2020	E, D&T, FU	GRADE	Focus on acute left-sided diverticulitis
ASCRS, USA, 2020	E, D&T, FU	GRADE	Focus on diverticular disease
Polish, Poland, 2015	E, D&T, FU	Do Not Grade the Strength	Focus on Diverticular Disease
SICCR, Italy, 2015	E, D&T, FU	GRADE	Focus on diverticular disease
GSG/GSGVS, Germany, 2014	E, D&T, FU	DCCG system Delphi process	Focus on diverticular disease
AGA, USA, 2015	E, D&T, FU	GRADE	Focus on acute left-sided diverticulitis
NSS, the Netherlands, 2013	E, D&T, FU	Oxford	Focus on acute left-sided diverticulitis
AAFP, USA, 2013	E, D&T, FU	SORT	Focus on acute left-sided diverticulitis
EAES, Europe, 2012	E, D&T, FU	Oxford Delphi	Focus on surgical aspects
DCCG, Denmark, 2012	E, D&T, FU	DCCG system	Focus on diverticular disease

NICE = National Institute for Health and Care Excellence; ESCP = European Society of Coloproctology; WSES = World Society of Emergency Surgery; GRADE = Grade of Recommendations Assessment, Development and Evaluation; ASCRS = American Society of Colon & Rectal Surgeons; SICCR = Italian Society of Colon and Rectal Surgeons; GSG/GSGVS = German Society of Gastroenterology/German Society for General and Visceral Surgery; AGA = American Gastroenterological Association; NSS, Netherlands Society of Surgery; AAFP = American Association of Family Physicians; EAES = European Association of Endoscopic Surgery; DCCG = Danish Surgical Society; E = epidemiology; D&T = diagnosis & treatment; FU = follow-up