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. Words match anywhere in the field.

Limit to evidence status or GRADE (optional)

915 questions in 93 reviews · Emergency and Critical Care

current versions
No studies 141 · 15.4%Ungraded 22 · 2.4%Very low 216 · 23.6%Low 272 · 29.7%Moderate 188 · 20.5%High 76 · 8.3%

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
Canakinumab vs standard care/placebo
Serious adverse eventsÂ
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
RR 0.8 [0.57, 1.13]2 studies · 499 participantsLow
Anakinra vs standard care/placebo
Clinical improvement D60 or aboveÂ
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
RR 0.93 [0.78, 1.12]1 study · 115 participantsVery low
Canakinumab vs standard care/placebo
Time to clinical improvement
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
HR 1.06 [0.87, 1.29]1 study · 454 participantsModerate
Canakinumab vs standard care/placebo
Time to WHO Clinical Progression Score of level 7 or above
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
HR 0.8 [0.47, 1.36]1 study · 454 participantsLow
Canakinumab vs standard care/placebo
Time to death
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
HR 0.71 [0.36, 1.43]2 studies · 499 participantsLow
Anakinra vs standard care/placebo
WHO Clinical Progression Score of level 7 or above D28
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
RR 0.67 [0.36, 1.22]2 studies · 722 participantsLow
Anakinra vs standard care/placebo
WHO Clinical Progression Score of level 7 or above D60 or aboveÂ
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
RR 0.54 [0.3, 0.96]1 study · 606 participantsLow
Anakinra vs standard care/placebo
All‐cause mortality D28
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
RR 0.69 [0.34, 1.39]2 studies · 722 participantsLow
Anakinra vs standard care/placebo
All‐cause mortality D60 or above
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
RR 1.03 [0.68, 1.56]4 studies · 1633 participantsVery low
Anakinra vs standard care/placebo
Adverse events
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
RR 1.02 [0.94, 1.11]2 studies · 722 participantsModerate
Anakinra vs standard care/placebo
Serious adverse eventsÂ
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
RR 0.95 [0.58, 1.56]2 studies · 722 participantsLow
Anakinra vs standard care/placebo
Time to clinical improvement
Interleukin‐1 blocking agents for treating COVID‐19 (2022) · Cochrane
HR 1.07 [0.91, 1.26]4 studies · 1633 participantsLow
BNT162b2 – Pfizer/BioNTech + Fosun Pharma vs placebo
Confirmed SARS‐CoV‐2 infectionÂ
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
mRNA‐1273 – ModernaTX vs placebo
Confirmed symptomatic COVID‐19 b
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extracted2 studies · 31632 participantsHigh
FINLAY‐FR‐2 – Instituto Finlay de Vacunas vs placebo
Systemic reactogenicity events
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
FINLAY‐FR‐2 – Instituto Finlay de Vacunas vs placebo
Any adverse event
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
FINLAY‐FR‐2 – Instituto Finlay de Vacunas vs placebo
Serious adverse events
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
FINLAY‐FR‐2 – Instituto Finlay de Vacunas vs placebo
Local reactogenicity events
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
Heterologous vaccination scheme vs homologous vaccination scheme
Confirmed SARS‐CoV‐2 infection
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
Heterologous vaccination scheme vs homologous vaccination scheme
Confirmed symptomatic COVID‐19
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
Heterologous vaccination scheme vs homologous vaccination scheme
Severe or critical COVID‐19
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
Heterologous vaccination scheme vs homologous vaccination scheme
All‐cause mortalityÂ
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
Heterologous vaccination scheme vs homologous vaccination scheme
Systemic reactogenicity eventsb
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 1.96 [0.52, 7.41]1 study · 101 participantsLow
Heterologous vaccination scheme vs homologous vaccination scheme
Any adverse eventf
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extracted3 studies · 3 participantsVery low
mRNA‐1273 – ModernaTX vs placebo
Severe or critical COVID‐19f
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extracted1 study · 28451 participantsHigh
Heterologous vaccination scheme vs homologous vaccination scheme
Serious adverse eventsk
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extracted1 study · 229 participantsVery low
Heterologous vaccination scheme vs homologous vaccination scheme
Local reactogenicity eventsb
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 11.76 [1.59, 87.14]1 study · 101 participantsLow
Booster vs placebo/no booster
Confirmed SARS‐CoV‐2 infection
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
Booster vs placebo/no booster
Confirmed symptomatic COVID‐19
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
Booster vs placebo/no booster
Severe or critical COVID‐19
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
Booster vs placebo/no booster
All‐cause mortalityb
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 1.27 [0.52, 3.05]1 study · 28254 participantsVery low
Booster vs placebo/no booster
Systemic reactogenicity eventsf
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 1.8 [0.71, 4.56]1 study · 119 participantsLow
Booster vs placebo/no booster
Any adverse event
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
Booster vs placebo/no booster
Serious adverse events
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
Booster vs placebo/no booster
Local reactogenicity eventsf
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 6.46 [3.18, 13.13]1 study · 119 participantsModerate
mRNA‐1273 – ModernaTX vs placebo
All‐cause mortalityf
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 1.06 [0.54, 2.1]1 study · 30346 participantsLow
mRNA‐1273 – ModernaTX vs placebo
Systemic reactogenicity eventsi
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 1.28 [1.22, 1.34]2 studies · 34037 participantsHigh
mRNA‐1273 – ModernaTX vs placebo
Any adverse eventk
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extracted2 studies · 32995 participantsLow
mRNA‐1273 – ModernaTX vs placebo
Serious adverse eventsl
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 0.92 [0.78, 1.08]2 studies · 34072 participantsModerate
mRNA‐1273 – ModernaTX vs placebo
Local reactogenicity eventsi
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 3.3 [2.02, 5.4]2 studies · 34037 participantsHigh
CVnCoV – CureVac AG vs placebo
Confirmed SARS‐CoV‐2 infection
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extractedNRNo studies
CVnCoV – CureVac AG vs placebo
Confirmed symptomatic COVID‐19b
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extracted1 study · 25062 participantsModerate
CVnCoV – CureVac AG vs placebo
Severe or critical COVID‐19f
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extracted1 study · 25062 participantsVery low
BNT162b2 – Pfizer/BioNTech + Fosun Pharma vs placebo
Confirmed symptomatic COVID‐19b
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extracted2 studies · 44077 participantsHigh
CVnCoV – CureVac AG vs placebo
All‐cause mortalityh
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 1.33 [0.46, 3.83]1 study · 39529 participantsVery low
CVnCoV – CureVac AG vs placebo
Systemic reactogenicity eventsi
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 1.48 [1.43, 1.53]1 study · 3982 participantsHigh
CVnCoV – CureVac AG vs placebo
Any adverse eventj
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 1.42 [1.38, 1.47]1 study · 3982 participantsModerate
CVnCoV – CureVac AG vs placebo
Serious adverse eventsk
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 1.24 [0.9, 1.71]1 study · 39529 participantsLow
CVnCoV – CureVac AG vs placebo
Local reactogenicity eventsi
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
RR 3.51 [3.24, 3.81]1 study · 3982 participantsHigh
ChAdOx1 – AstraZeneca + University of Oxford vs placebo
Confirmed SARS‐CoV‐2 infectionb
Efficacy and safety of COVID‐19 vaccines (2022) · Cochrane
no estimate extracted5 studies · 43390 participantsModerate