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)

75,239 questions in 5,342 reviews

current versions
No studies 15,213 · 20.2%Ungraded 10,323 · 13.7%Very low 17,528 · 23.3%Low 17,951 · 23.9%Moderate 11,190 · 14.9%High 3,034 · 4%

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
Intervention NR
All‐cause mortality all included trials Mortality · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 1.4 [0.62, 3.16]1 study · 585 participantsHigh
Intervention NR
Hepatitis A‐related mortality · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Clinically apparent hepatitis A (inactivated HAV vaccines) low risk of bias trials Dienstag 1999 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 0.09 [0.03, 0.3]3 studies · 41430 participantsHigh
Intervention NR
Lack of sero‐protection, (anti HAV IgG < 10mIU/L) (low risk of bias) Maiwald 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Lack of sero‐protection, (anti HAV IgG < 10mIU/L) (all included trials) Maiwald 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Lack of sero‐protection, (anti HAV IgG < 20mIU/L) (low risk of bias ) Maiwald 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 0.01 [0, 0.03]1 study · 486 participantsHigh
Intervention NR
Lack of sero‐protection, (anti HAV IgG < 20mIU/L) (all included trials) Maiwald 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 0.01 [0, 0.03]2 studies · 739 participantsLow
Intervention NR
Non‐serious local adverse events (low risk of bias) inactivated HAV vaccine ICH‐GCP 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 1.19 [0.67, 2.11]2 studies · 1299 participantsHigh
Intervention NR
Non‐serious local adverse events (all included trials) ICH‐GCP 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 1.21 [0.86, 1.7]4 studies · 1559 participantsLow
Intervention NR
Non‐serious systemic adverse events (low risk of bias) inactivated HAV vaccine ICH‐GCP 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 1.09 [0.67, 1.78]3 studies · 1299 participantsHigh
Intervention NR
Non‐serious systemic adverse events (all included studies) inactivated HAV vaccine ICH‐GCP 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 0.98 [0.68, 1.41]4 studies · 1599 participantsLow
Intervention NR
Non‐serious local adverse events (low risk of bias) live attenuated HAV vaccine ICH‐GCP 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Non‐serious local adverse events (all included studies) live attenuated HAV vaccine ICH‐GCP 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Clinically apparent hepatitis A (inactivated HAV vaccines) all included trials Dienstag 1999 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 0.12 [0.05, 0.31]4 studies · 41690 participantsLow
Intervention NR
Non‐serious systemic adverse events (low risk of bias) live attenuated HAV vaccine ICH‐GCP 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Non‐serious systemic adverse events (all included studies) live attenuated HAV vaccine ICH‐GCP 1997 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Clinically apparent hepatitis A (live attenuated HAV vaccines) low risk of bias Dienstag 1999 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Clinically apparent hepatitis A (live attenuated HAV vaccines) all included trials Dienstag 1999 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 0.07 [0.03, 0.17]5 studies · 690690 participantsVery low
Intervention NR
Clinically apparent hepatitis A (Dose of live attenuated HAV vaccine, titre >= TCID50 ) low risk of bias Dienstag 1999 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Clinically apparent hepatitis A (Dose of live attenuated HAV vaccine, titre >= TCID50 ) all included trials Dienstag 1999 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
RR 0.03 [0.02, 0.06]2 studies · 62270 participantsVery low
Intervention NR
Clinically apparent hepatitis A (Dose of live attenuated HAV vaccine, titre < TCID50 ) low risk of bias Dienstag 1999 · patients with preventing hepatitis A.
Hepatitis A immunisation in persons not previously exposed to hepatitis A (2012) · Cochrane
no estimate extractedNRNo studies
Whole ‐body vibration vs an active physical therapy (short‐term effects)
Body balance Functional Reach test · patients with neurodegenerative disease
Whole‐body vibration training for patients with neurodegenerative disease (2012) · Cochrane
no estimate extracted2 studies · 45 participantsLow
Whole ‐body vibration vs an active physical therapy (short‐term effects)
Gait Timed Up and Go test · patients with neurodegenerative disease
Whole‐body vibration training for patients with neurodegenerative disease (2012) · Cochrane
no estimate extracted2 studies · 45 participantsLow
Whole‐ body vibration vs an active physical therapy (long‐term effects)
Body balance Berg Balance Scale and Tinetti test · patients with neurodegenerative disease
Whole‐body vibration training for patients with neurodegenerative disease (2012) · Cochrane
no estimate extracted2 studies · 42 participantsVery low
Whole‐ body vibration vs an active physical therapy (long‐term effects)
Gait Time Up and Go test and Stand‐walk‐sit test · patients with neurodegenerative disease
Whole‐body vibration training for patients with neurodegenerative disease (2012) · Cochrane
no estimate extracted2 studies · 42 participantsVery low
Whole‐ body vibration vs an active physical therapy (long‐term effects)
UPDRS III UPDRS scale (motor score). Scale from: 0 to 56. · patients with neurodegenerative disease
Whole‐body vibration training for patients with neurodegenerative disease (2012) · Cochrane
no estimate extracted2 studies · 42 participantsVery low
Amitriptyline vs placebo
Response to treatment At least 50% reduction of a depression scale (mainly Hamilton Depression Rating Scale) · adults with major depressive disorder
Amitriptyline versus placebo for major depressive disorder (2012) · Cochrane
OR 2.64 [2.28, 3.06]31 studies · 3228 participantsModerate
Amitriptyline vs placebo
Death due to suicide · adults with major depressive disorder
Amitriptyline versus placebo for major depressive disorder (2012) · Cochrane
no estimate extractedNRNo studies
Amitriptyline vs placebo
Quality of life · adults with major depressive disorder
Amitriptyline versus placebo for major depressive disorder (2012) · Cochrane
no estimate extractedNRNo studies
Amitriptyline vs placebo
Acceptability of treatment Drop‐out for any reason · adults with major depressive disorder
Amitriptyline versus placebo for major depressive disorder (2012) · Cochrane
OR 0.71 [0.55, 0.93]24 studies · 2400 participantsVery low
Amitriptyline vs placebo
Overall tolerability Drop‐out due to adverse events · adults with major depressive disorder
Amitriptyline versus placebo for major depressive disorder (2012) · Cochrane
OR 4.15 [2.71, 6.35]19 studies · 2174 participantsModerate
Bezafibrate vs no intervention
All‐cause mortality · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
RD 03 studies · 60 participantsVery low
Bezafibrate vs ursodeoxycholic acid
Adverse events · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
RR 6.19 [0.31, 122.05]2 studies · 69 participantsVery low
Bezafibrate vs ursodeoxycholic acid
Serum alkaline phosphatases (U/L) · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
no estimate extracted2 studies · 48 participantsModerate
Bezafibrate vs no intervention
Liver morbidity · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
RD 03 studies · 60 participantsVery low
Bezafibrate vs no intervention
Adverse events · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
RR 5.4 [0.69, 42.32]3 studies · 60 participantsVery low
Bezafibrate vs no intervention
Serum alkaline phosphatases (U/L) · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
no estimate extracted4 studies · 79 participantsLow
Bezafibrate vs no intervention
Serum alkaline phosphatases (U/L) ‐ duration of administration 6 months · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
no estimate extracted2 studies · 38 participantsVery low
Bezafibrate vs no intervention
Serum alkaline phosphatases (U/L) ‐ duration of administration 12 to 13 months · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
no estimate extracted2 studies · 41 participantsLow
Bezafibrate vs no intervention
Serum bilirubin (mg/dl) · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
no estimate extracted2 studies · 34 participantsVery low
Bezafibrate vs ursodeoxycholic acid
All‐cause mortality · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
RD 02 studies · 69 participantsVery low
Bezafibrate vs ursodeoxycholic acid
Liver morbidity · patients with primary biliary cirrhosis.
Bezafibrate for primary biliary cirrhosis (2012) · Cochrane
RD 02 studies · 69 participantsVery low
Tiotropium vs long‐acting beta‐agonists
Quality of life (SGRQ) · patients with stable chronic obstructive pulmonary disease and > 10 pack years smoking history
Tiotropium versus long‐acting beta‐agonists for stable chronic obstructive pulmonary disease (2012) · Cochrane
no estimate extracted4 studies · 4935 participantsUngraded
Tiotropium vs long‐acting beta‐agonists
Patients with 1 or more exacerbations · patients with stable chronic obstructive pulmonary disease and > 10 pack years smoking history
Tiotropium versus long‐acting beta‐agonists for stable chronic obstructive pulmonary disease (2012) · Cochrane
OR 0.86 [0.79, 0.93]6 studies · 12123 participantsModerate
Tiotropium vs long‐acting beta‐agonists
Mortality (all‐cause) · patients with stable chronic obstructive pulmonary disease and > 10 pack years smoking history
Tiotropium versus long‐acting beta‐agonists for stable chronic obstructive pulmonary disease (2012) · Cochrane
OR 0.82 [0.6, 1.13]6 studies · 12123 participantsVery low
Tiotropium vs long‐acting beta‐agonists
Cost‐effectiveness · patients with stable chronic obstructive pulmonary disease and > 10 pack years smoking history
Tiotropium versus long‐acting beta‐agonists for stable chronic obstructive pulmonary disease (2012) · Cochrane
no estimate extracted6 participantsLow
Arthroplasty vs fusion
Arm pain at 1 to 2 years VAS or NRS · patients with single‐level cervical degenerative disc disease
Arthroplasty versus fusion in single-level cervical degenerative disc disease (2012) · Cochrane
no estimate extracted6 studies · 1310 participantsLow
Arthroplasty vs fusion
Neck pain at 1 to 2 years VAS or NRS · patients with single‐level cervical degenerative disc disease
Arthroplasty versus fusion in single-level cervical degenerative disc disease (2012) · Cochrane
no estimate extracted6 studies · 1309 participantsModerate
Arthroplasty vs fusion
Neck‐related functional status at 1 to 2 years NDI · patients with single‐level cervical degenerative disc disease
Arthroplasty versus fusion in single-level cervical degenerative disc disease (2012) · Cochrane
no estimate extracted6 studies · 1505 participantsModerate
Arthroplasty vs fusion
Patient satisfaction at 1 to 2 years · patients with single‐level cervical degenerative disc disease
Arthroplasty versus fusion in single-level cervical degenerative disc disease (2012) · Cochrane
RR 1.06 [1, 1.12]2 studies · 498 participantsVery low