Gap finder

Search review questions

Each row is one question a systematic review asked: who, what, compared with what, and which outcome, with the effect it found and how certain that is. Every word you type has to appear somewhere in the question, and the closest matches are ranked first.

Limit to evidence status or GRADE (optional)

15,213 questions in 2,394 reviews

current versions
No studies 15,213 · 100%Ungraded 0 · 0%Very low 0 · 0%Low 0 · 0%Moderate 0 · 0%High 0 · 0%

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.

QuestionEffectEvidenceStatus / GRADE
Systemic antibiotics alone vs systematic antibiotics plus antibiotic lock solution
Stenosis or thrombosis of vascular access site after catheter removal · patients on maintenance HD with CRBSI
Interventions for treating catheter‐related bloodstream infections in people receiving maintenance… (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Limb function at 6 or 12 months · adults with open long bone fractures; study in the review included only Gustilo II open tibia fractures
Timing of antibiotic administration, wound debridement, and the stages of reconstructive surgery for open… (2022) · Cochrane
no estimate extractedNRNo studies
Timing of wound closure (immediate vs delayed)
Unplanned operations at 12 months · adults with open long bone fractures of the upper and lower limbs
Timing of antibiotic administration, wound debridement, and the stages of reconstructive surgery for open… (2022) · Cochrane
no estimate extractedNRNo studies
Timing of wound closure (immediate vs delayed)
Return to work by 12 months · adults with open long bone fractures of the upper and lower limbs
Timing of antibiotic administration, wound debridement, and the stages of reconstructive surgery for open… (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
HRQoL at 6 or 12 months · adults with open long bone fractures; study in the review included only Gustilo II open tibia fractures
Timing of antibiotic administration, wound debridement, and the stages of reconstructive surgery for open… (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Deep surgical site infection at 30 days or 90 days, or time points reported by study authors · adults with open long bone fractures; study in the review included only Gustilo II open tibia fractures
Timing of antibiotic administration, wound debridement, and the stages of reconstructive surgery for open… (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Delayed or non‐union at time points reported by study authors · adults with open long bone fractures; study in the review included only Gustilo II open tibia fractures
Timing of antibiotic administration, wound debridement, and the stages of reconstructive surgery for open… (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Unplanned operations at 12 months · adults with open long bone fractures; study in the review included only Gustilo II open tibia fractures
Timing of antibiotic administration, wound debridement, and the stages of reconstructive surgery for open… (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Return to work by 12 months · adults with open long bone fractures; study in the review included only Gustilo II open tibia fractures
Timing of antibiotic administration, wound debridement, and the stages of reconstructive surgery for open… (2022) · Cochrane
no estimate extractedNRNo studies
Timing of wound closure (immediate vs delayed)
Limb function at 6 or 12 months · adults with open long bone fractures of the upper and lower limbs
Timing of antibiotic administration, wound debridement, and the stages of reconstructive surgery for open… (2022) · Cochrane
no estimate extractedNRNo studies
Timing of wound closure (immediate vs delayed)
HRQoL at 6 or 12 months · adults with open long bone fractures of the upper and lower limbs
Timing of antibiotic administration, wound debridement, and the stages of reconstructive surgery for open… (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Outcomes ( · health professionals from the USA and participants (“healthy volunteers from the Biobank cohort”) from the UK
Effects of a gluten‐reduced or gluten‐free diet for the primary prevention of cardiovascular disease (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
All‐cause mortality · healthy normal weighted participants recruited through leaflets from Italy
Effects of a gluten‐reduced or gluten‐free diet for the primary prevention of cardiovascular disease (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Non‐fatal MI · healthy normal weighted participants recruited through leaflets from Italy
Effects of a gluten‐reduced or gluten‐free diet for the primary prevention of cardiovascular disease (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Stroke · healthy normal weighted participants recruited through leaflets from Italy
Effects of a gluten‐reduced or gluten‐free diet for the primary prevention of cardiovascular disease (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Peripheral artery disease · healthy normal weighted participants recruited through leaflets from Italy
Effects of a gluten‐reduced or gluten‐free diet for the primary prevention of cardiovascular disease (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Type 2 diabetes · healthy normal weighted participants recruited through leaflets from Italy
Effects of a gluten‐reduced or gluten‐free diet for the primary prevention of cardiovascular disease (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Stroke · health professionals from the USA and participants (“healthy volunteers from the Biobank cohort”) from the UK
Effects of a gluten‐reduced or gluten‐free diet for the primary prevention of cardiovascular disease (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Peripheral artery disease · health professionals from the USA and participants (“healthy volunteers from the Biobank cohort”) from the UK
Effects of a gluten‐reduced or gluten‐free diet for the primary prevention of cardiovascular disease (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Systolic blood pressure · health professionals from the USA and participants (“healthy volunteers from the Biobank cohort”) from the UK
Effects of a gluten‐reduced or gluten‐free diet for the primary prevention of cardiovascular disease (2022) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Cardiovascular mortality · healthy normal weighted participants recruited through leaflets from Italy
Effects of a gluten‐reduced or gluten‐free diet for the primary prevention of cardiovascular disease (2022) · Cochrane
no estimate extractedNRNo studies
D‐mannose (2 g) vs nitrofurantoin (50 mg)
Asymptomatic bacteriuria · women with acute cystitis or history of recurrent acute cystitis (preventing and treating)
D‐mannose for preventing and treating urinary tract infections (2022) · Cochrane
no estimate extractedNRNo studies
D‐mannose (2 g) vs nitrofurantoin (50 mg)
Changes to previous treatment regimen · women with acute cystitis or history of recurrent acute cystitis (preventing and treating)
D‐mannose for preventing and treating urinary tract infections (2022) · Cochrane
no estimate extractedNRNo studies
D‐mannose (2 g) vs nitrofurantoin (50 mg)
Pain · women with acute cystitis or history of recurrent acute cystitis (preventing and treating)
D‐mannose for preventing and treating urinary tract infections (2022) · Cochrane
no estimate extractedNRNo studies
D‐mannose (2 g) vs nitrofurantoin (50 mg)
Cure/complete remission · women with acute cystitis or history of recurrent acute cystitis (preventing and treating)
D‐mannose for preventing and treating urinary tract infections (2022) · Cochrane
no estimate extractedNRNo studies
D‐mannose (2 g) vs no treatment
Symptomatic‐only UTI · women with acute cystitis or history of recurrent acute cystitis (preventing and treating)
D‐mannose for preventing and treating urinary tract infections (2022) · Cochrane
no estimate extractedNRNo studies
D‐mannose (2 g) vs no treatment
Asymptomatic bacteriuria · women with acute cystitis or history of recurrent acute cystitis (preventing and treating)
D‐mannose for preventing and treating urinary tract infections (2022) · Cochrane
no estimate extractedNRNo studies
D‐mannose (2 g) vs no treatment
Changes to previous treatment regimen · women with acute cystitis or history of recurrent acute cystitis (preventing and treating)
D‐mannose for preventing and treating urinary tract infections (2022) · Cochrane
no estimate extractedNRNo studies
D‐mannose (2 g) vs no treatment
Pain · women with acute cystitis or history of recurrent acute cystitis (preventing and treating)
D‐mannose for preventing and treating urinary tract infections (2022) · Cochrane
no estimate extractedNRNo studies
D‐mannose (2 g) vs no treatment
Cure/complete remission · women with acute cystitis or history of recurrent acute cystitis (preventing and treating)
D‐mannose for preventing and treating urinary tract infections (2022) · Cochrane
no estimate extractedNRNo studies
D‐mannose (2 g) vs nitrofurantoin (50 mg)
Symptomatic only UTI · women with acute cystitis or history of recurrent acute cystitis (preventing and treating)
D‐mannose for preventing and treating urinary tract infections (2022) · Cochrane
no estimate extractedNRNo studies
Open reduction vs closed reduction position
Functional outcome · children with displaced supracondylar elbow fractures
Interventions for treating supracondylar elbow fractures in children (2022) · Cochrane
no estimate extractedNRNo studies
Open reduction vs closed reduction position
Treatment failure requiring re‐intervention · children with displaced supracondylar elbow fractures
Interventions for treating supracondylar elbow fractures in children (2022) · Cochrane
no estimate extractedNRNo studies
Open reduction vs closed reduction position
Cosmetic deformity Measured as the presence of cubitus varus · children with displaced supracondylar elbow fractures
Interventions for treating supracondylar elbow fractures in children (2022) · Cochrane
no estimate extractedNRNo studies
Surgical fixation vs non‐surgical immobilisation
Functional outcome · children with displaced fractures
Interventions for treating supracondylar elbow fractures in children (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled muscarinic antagonists vs placebo
Number of exacerbations  · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled muscarinic antagonists vs placebo
Participant‐reported symptom score  · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled muscarinic antagonists vs placebo
Change from baseline in FVC (% predicted) Â · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled muscarinic antagonists vs placebo
Sputum volume (mL) Â · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled beta‐2 agonists vs short‐acting inhaled muscarinic antagonists
Change from baseline in FEV1 (% predicted) Â · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled beta‐2 agonists vs short‐acting inhaled muscarinic antagonists
Quality of life  · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled beta‐2 agonists vs short‐acting inhaled muscarinic antagonists
Number of exacerbations  · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled beta‐2 agonists vs short‐acting inhaled muscarinic antagonists
Participant‐reported symptom score  · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled beta‐2 agonists vs placebo
Quality of life  · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled beta‐2 agonists vs short‐acting inhaled muscarinic antagonists
Change from baseline in FVC (% predicted) Â · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled beta‐2 agonists vs short‐acting inhaled muscarinic antagonists
Sputum volume (mL) Â · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Short‐acting inhaled muscarinic antagonists vs placebo
Quality of life  · children and adults with cystic fibrosis
Short‐acting inhaled bronchodilators for cystic fibrosis (2022) · Cochrane
no estimate extractedNRNo studies
Heparin started before vs after the surgical procedure
PE · people undergoing bariatric surgery
Pharmacological interventions for preventing venous thromboembolism in people undergoing bariatric surgery (2022) · Cochrane
no estimate extractedNRNo studies
Heparin started before vs after the surgical procedure
Adverse events (thrombocytopenia) · people undergoing bariatric surgery
Pharmacological interventions for preventing venous thromboembolism in people undergoing bariatric surgery (2022) · Cochrane
no estimate extractedNRNo studies
Combined mechanical and pharmacological prophylaxis vs mechanical prophylaxis alone
PE · people undergoing bariatric surgery
Pharmacological interventions for preventing venous thromboembolism in people undergoing bariatric surgery (2022) · Cochrane
no estimate extractedNRNo studies