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)

2,434 questions in 139 reviews · Kidney and Transplant

current versions
No studies 504 · 20.7%Ungraded 40 · 1.6%Very low 611 · 25.1%Low 790 · 32.5%Moderate 414 · 17%High 75 · 3.1%

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
Reduced salt intake vs usual or high salt intake
Body weight: all studies Duration: up to 12 weeks · patients with diabetes with or without CKD
Altered dietary salt intake for preventing diabetic kidney disease and its progression (2023) · Cochrane
no estimate extracted12 studies · 454 participantsLow
Net change in blood pressure in hypertensive and normotensive participants with a reduced salt intake vs usual or high salt intake
Systolic BP Duration: up to 12 weeks · patients with diabetes with or without CKD
Altered dietary salt intake for preventing diabetic kidney disease and its progression (2023) · Cochrane
no estimate extracted5 studies · 108 participantsLow
Net change in blood pressure in hypertensive and normotensive participants with a reduced salt intake vs usual or high salt intake
Diastolic BP Duration: up to 12 weeks · patients with diabetes with or without CKD
Altered dietary salt intake for preventing diabetic kidney disease and its progression (2023) · Cochrane
no estimate extracted5 studies · 108 participantsLow
Standard interferon vs placebo or control
Death · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 0.89 [0.06, 13.23]5 studies · 134 participantsLow
Pegylated interferon alpha‐2a vs standard interferon
Sustained virological response 6 months after stopping treatment · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 2.4 [0.99, 5.81]1 study · 50 participantsLow
Pegylated interferon alpha‐2a vs standard interferon
Treatment discontinuation · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 0.11 [0.01, 1.96]1 study · 50 participantsLow
Pegylated interferon alpha‐2a vs standard interferon
Adverse events · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 0.11 [0.01, 1.96]1 study · 50 participantsLow
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
Death · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
PEG interferon alpha‐2a · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 5.66 [0.69, 46.31]1 study · 81 participantsLow
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
PEG interferon alpha‐2b · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 2.4 [0.11, 51.32]1 study · 16 participantsLow
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
PEG interferon (combined) · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 4.3 [0.76, 24.33]2 studies · 97 participantsModerate
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
PEG interferon alpha‐2a · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.12 [0.4, 2.21]1 study · 43 participantsLow
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
PEG interferon (combined) · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.12 [0.4, 2.21]1 study · 43 participantsLow
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
End‐of‐treatment response · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Standard interferon vs placebo or control
Relapse(recurrence after stopping intervention) · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 0.72 [0.28, 1.88]1 study · 12 participantsLow
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
PEG interferon alpha‐2a · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.19 [0.79, 1.78]1 study · 81 participantsLow
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
PEG interferon (alpha‐2b) · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 5.6 [0.34, 93.35]1 study · 16 participantsLow
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
PEG interferon alpha‐2a · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.13 [0.64, 2]1 study · 81 participantsLow
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
Treatment discontinuation · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
Adverse events · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
PEG interferon (combined) · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.05 [0.61, 1.83]2 studies · 97 participantsModerate
High vs low dose pegylated interferon alpha‐2a or alpha‐2b
Serious adverse events · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Standard interferon plus ribavirin vs standard interferon alone
Death · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Standard interferon plus ribavirin vs standard interferon alone
Relapse(recurrence after stopping) · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Standard interferon plus ribavirin vs standard interferon alone
End‐of‐treatment response · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Standard interferon vs placebo or control
End‐of‐treatment response · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 8.62 [3.03, 24.55]5 studies · 132 participantsModerate
Standard interferon plus ribavirin vs standard interferon alone
Sustained virological response · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Standard interferon plus ribavirin vs standard interferon alone
Treatment discontinuation · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 2.97 [1.19, 7.36]1 study · 52 participantsLow
Standard interferon plus ribavirin vs standard interferon alone
Adverse events · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Pegylated interferon plus ribavirin vs pegylated interferon alone
Death · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Pegylated interferon plus ribavirin vs pegylated interferon alone
Relapse(recurrence after stopping) · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 0.33 [0.23, 0.48]1 study · 377 participantsLow
Pegylated interferon plus ribavirin vs pegylated interferon alone
End‐of‐treatment response · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.01 [0.94, 1.09]1 study · 377 participantsLow
Pegylated interferon plus ribavirin vs pegylated interferon alone
Sustained virological response · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.8 [1.46, 2.21]1 study · 377 participantsLow
Pegylated interferon plus ribavirin vs pegylated interferon alone
Treatment discontinuation · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.71 [0.69, 4.24]1 study · 377 participantsLow
Pegylated interferon plus ribavirin vs pegylated interferon alone
Adverse events · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.1 [1.01, 1.19]1 study · 377 participantsLow
Direct antivirals (grazoprevir and elbasvir) vs placebo
Death · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Standard interferon vs placebo or control
Sustained virological response 6 months after stopping treatment · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 3.25 [0.81, 13.07]4 studies · 98 participantsModerate
Direct antivirals (grazoprevir and elbasvir) vs placebo
Relapse · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Direct antivirals (grazoprevir and elbasvir) vs placebo
End‐of‐treatment response · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 174.99 [11.03, 2775.78]1 study · 173 participantsLow
Direct antivirals (grazoprevir and elbasvir) vs placebo
Sustained virological response · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Direct antivirals (grazoprevir and elbasvir) vs placebo
Treatment discontinuation · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Direct antivirals (grazoprevir and elbasvir) vs placebo
Adverse events · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Pegylated interferon + ribavirin (24 weeks) + initial telepravir (12 weeks) vs pegylated interferon (48 weeks) + initial telepravir (12 weeks) + initial low dose ribavirin (12 + 36 weeks)
Death · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Pegylated interferon + ribavirin (24 weeks) + initial telepravir (12 weeks) vs pegylated interferon (48 weeks) + initial telepravir (12 weeks) + initial low dose ribavirin (12 + 36 weeks)
Relapse · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Pegylated interferon + ribavirin (24 weeks) + initial telepravir (12 weeks) vs pegylated interferon (48 weeks) + initial telepravir (12 weeks) + initial low dose ribavirin (12 + 36 weeks)
Sustained virological response · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.02 [0.67, 1.56]1 study · 35 participantsVery low
Pegylated interferon + ribavirin (24 weeks) + initial telepravir (12 weeks) vs pegylated interferon (48 weeks) + initial telepravir (12 weeks) + initial low dose ribavirin (12 + 36 weeks)
End‐of‐treatment response · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 1.02 [0.67, 1.56]1 study · 35 participantsVery low
Pegylated interferon + ribavirin (24 weeks) + initial telepravir (12 weeks) vs pegylated interferon (48 weeks) + initial telepravir (12 weeks) + initial low dose ribavirin (12 + 36 weeks)
Treatment discontinuation · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Standard interferon vs placebo or control
Treatment discontinuation · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 4.59 [0.49, 42.69]4 studies · 116 participantsModerate
Pegylated interferon + ribavirin (24 weeks) + initial telepravir (12 weeks) vs pegylated interferon (48 weeks) + initial telepravir (12 weeks) + initial low dose ribavirin (12 + 36 weeks)
Adverse events · HD patients with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
no estimate extractedNRNo studies
Standard interferon vs placebo or control
Adverse events · patients on HD with HCV infection
Interventions for dialysis patients with hepatitis C virus (HCV) infection (2023) · Cochrane
RR 3.56 [0.98, 13.01]5 studies · 143 participantsModerate