Cochrane Review Group

Colorectal

57 systematic reviews in Colorectal ask 759 questions. 12% have no studies to answer them, 27.5% rest on very low certainty evidence and 28.7% reach moderate or high certainty.

Reviews

Questions

759

current versions

No studies

12%

Moderate or high

28.7%

No studies 91 · 12%Ungraded 12 · 1.6%Very low 209 · 27.5%Low 229 · 30.2%Moderate 160 · 21.1%High 58 · 7.6%

Ungraded means an effect was reported without a GRADE rating; it is not a gap. No studies means the review found nothing to answer the question. The six categories are a display order, not a score.

Search questions in Colorectal

Thinnest evidence

All no studies and very low questions

Question	Effect	Evidence	Status / GRADE
Preoperative parenteral nutrition vs usual care or control Non‐infectious complications · people undergoing gastrointestinal surgery Preoperative nutrition therapy in people undergoing gastrointestinal surgery (2024) · Cochrane	RR 0.61 [0.36, 1.02]	3 studies · 260 participants	Very low
Oral nutritional supplements vs usual care or control Infectious complications recorded up to 30 days postdischarge · people undergoing gastrointestinal surgery Preoperative nutrition therapy in people undergoing gastrointestinal surgery (2024) · Cochrane	RR 0.88 [0.6, 1.27]	5 studies · 473 participants	Very low
Preoperative parenteral nutrition vs usual care or control Infectious complications · people undergoing gastrointestinal surgery Preoperative nutrition therapy in people undergoing gastrointestinal surgery (2024) · Cochrane	RR 0.98 [0.53, 1.8]	3 studies · 260 participants	Very low
Preoperative parenteral nutrition vs usual care or control Length of hospital stay (days) · people undergoing gastrointestinal surgery Preoperative nutrition therapy in people undergoing gastrointestinal surgery (2024) · Cochrane	no estimate extracted	2 studies · 135 participants	Very low
Preoperative enteral nutrition (standard formula) vs usual care or control Non‐infectious complications · people undergoing gastrointestinal surgery Preoperative nutrition therapy in people undergoing gastrointestinal surgery (2024) · Cochrane	no estimate extracted	NR	No studies
Preoperative enteral nutrition (standard formula) vs usual care or control Infectious complications · people undergoing gastrointestinal surgery Preoperative nutrition therapy in people undergoing gastrointestinal surgery (2024) · Cochrane	RR 0.9 [0.59, 1.38]	2 studies · 126 participants	Very low
Preoperative enteral nutrition (standard formula) vs usual care or control Length of hospital stay (days) · people undergoing gastrointestinal surgery Preoperative nutrition therapy in people undergoing gastrointestinal surgery (2024) · Cochrane	no estimate extracted	2 studies · 126 participants	Very low
Early vs delayed open or laparoscopic appendicectomy Overall morbidity Median · paediatric and adult participants with appendiceal phlegmon Early versus delayed appendicectomy for appendiceal phlegmon or abscess (2024) · Cochrane	RR 0.74 [0.19, 2.86]	3 studies · 146 participants	Very low
Early vs delayed laparoscopic appendicectomy Abdominal abscess · paediatric participants with appendiceal abscess Early versus delayed appendicectomy for appendiceal phlegmon or abscess (2024) · Cochrane	no estimate extracted	NR	No studies
Early vs delayed laparoscopic appendicectomy Faecal fistula · paediatric participants with appendiceal abscess Early versus delayed appendicectomy for appendiceal phlegmon or abscess (2024) · Cochrane	no estimate extracted	NR	No studies
Early vs delayed laparoscopic appendicectomy Mortality · paediatric participants with appendiceal abscess Early versus delayed appendicectomy for appendiceal phlegmon or abscess (2024) · Cochrane	no estimate extracted	1 study · 40 participants	Very low
Early vs delayed laparoscopic appendicectomy Total length of hospital stay (days) · paediatric participants with appendiceal abscess Early versus delayed appendicectomy for appendiceal phlegmon or abscess (2024) · Cochrane	no estimate extracted	1 study · 40 participants	Very low