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
Raloxifene vs placebo
Mean change in BMD of the lumbar spine · postmenopausal women with osteoporosis and CKD stages 5 and 5D
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
MD 0.03 [0.03, 0.04]2 studies · 110 participantsLow
Raloxifene vs placebo
Mean change in BMD of the total hip · postmenopausal women with osteoporosis and CKD stages 5 and 5D
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
no estimate extractedNRNo studies
Raloxifene vs placebo
Mean change in BMD of the distal radius · postmenopausal women with osteoporosis and CKD stages 5 and 5D
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
no estimate extractedNRNo studies
Raloxifene vs placebo
Adverse events · postmenopausal women with osteoporosis and CKD stages 5 and 5D
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
no estimate extracted2 studies · 110 participantsVery low
Raloxifene vs placebo
Death · postmenopausal women with osteoporosis and CKD stages 5 and 5D
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
RR 12 studies · 110 participantsVery low
Raloxifene vs placebo
QoL · postmenopausal women with osteoporosis and CKD stages 5 and 5D
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
no estimate extractedNRNo studies
Any anti‐osteoporotic drugs vs placebo
Clinical fracture · postmenopausal women with osteoporosis and CKD stages 3‐4
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
RR 0.91 [0.79, 1.05]4 studies · 5827 participantsModerate
Any anti‐osteoporotic drugs vs placebo
Mean change in BMD of the femoral neck · postmenopausal women with osteoporosis and CKD stages 3‐4
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
no estimate extracted3 studies · 6081 participantsVery low
Any anti‐osteoporotic drugs vs placebo
Mean change in BMD of the lumbar spine · postmenopausal women with osteoporosis and CKD stages 3‐4
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
no estimate extracted5 studies · 9054 participantsVery low
Any anti‐osteoporotic drugs vs placebo
Mean change in BMD of the total hip · postmenopausal women with osteoporosis and CKD stages 3‐4
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
no estimate extracted3 studies · 3998 participantsVery low
Any anti‐osteoporotic drugs vs placebo
Mean change in BMD of the distal radius · postmenopausal women with osteoporosis and CKD stages 3‐4
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
no estimate extractedNRNo studies
Any anti‐osteoporotic drugs vs placebo
Adverse events · postmenopausal women with osteoporosis and CKD stages 3‐4
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
RR 0.99 [0.98, 1]5 studies · 9054 participantsModerate
Any anti‐osteoporotic drugs vs placebo
Death · postmenopausal women with osteoporosis and CKD stages 3‐4
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
no estimate extracted2 studies · 4973 participantsLow
Any anti‐osteoporotic drugs vs placebo
QoL · postmenopausal women with osteoporosis and CKD stages 3‐4
Pharmacological interventions versus placebo, no treatment or usual care for osteoporosis in people with… (2021) · Cochrane
no estimate extractedNRNo studies
Steroid therapy in first episode of nephrotic syndrome: 3 months or more vs 2 months of therapy
Number with frequent relapses by 12 to 24 months · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.86 [0.71, 1.06]8 studies · 976 participantsModerate
Steroid therapy in first episode of nephrotic syndrome: five to seven months vs three months
Subgroup analysis by risk of bias for number with frequent relapses: low risk of selection bias · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.99 [0.74, 1.33]3 studies · 376 participantsHigh
Steroid therapy in first episode of nephrotic syndrome: five to seven months vs three months
Subgroup analysis by risk of bias for number with frequent relapses: Unclear or high risk of selection bias · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.48 [0.32, 0.72]3 studies · 330 participantsModerate
Steroid therapy in first episode of nephrotic syndrome: five to seven months vs three months
Adverse events: hypertension · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 1.11 [0.71, 1.74]6 studies · 752 participantsModerate
Steroid therapy in first episode of nephrotic syndrome: five to seven months vs three months
Adverse events: eye complications · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.46 [0.18, 1.17]5 studies · 614 participantsModerate
Steroid therapy in first episode of nephrotic syndrome: five to seven months vs three months
Adverse events: Cushingoid appearance · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.86 [0.61, 1.23]6 studies · 762 participantsModerate
Steroid therapy in first episode of nephrotic syndrome: five to seven months vs three months
Adverse events: psychological disorders · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.3 [0.05, 1.83]4 studies · 505 participantsLow
Steroid therapy in first episode of nephrotic syndrome: 3 months or more vs 2 months of therapy
Number of children relapsing by 12 to 24 months · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.77 [0.63, 0.95]12 studies · 1309 participantsLow
Steroid therapy in first episode of nephrotic syndrome: 3 months or more vs 2 months of therapy
Number with frequent relapses by 12 to 24 months stratified by risk of selection bias: Low risk of selection bias · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.99 [0.82, 1.19]4 studies · 585 participantsHigh
Steroid therapy in first episode of nephrotic syndrome: 3 months or more vs 2 months of therapy
Number with frequent relapses by 12 to 24 months stratified by risk of selection bias: Unclear or high risk of bias for allocation bias · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.45 [0.26, 0.77]3 studies · 220 participantsLow
Steroid therapy in first episode of nephrotic syndrome: 3 months or more vs 2 months of therapy
Adverse events: psychological disorders · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 1 [0.53, 1.9]4 studies · 456 participantsLow
Steroid therapy in first episode of nephrotic syndrome: 3 months or more vs 2 months of therapy
Adverse events: hypertension · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 1.78 [0.55, 5.73]7 studies · 548 participantsModerate
Steroid therapy in first episode of nephrotic syndrome: 3 months or more vs 2 months of therapy
Adverse events: Cushing's syndrome · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 1.12 [0.76, 1.65]5 studies · 547 participantsModerate
Steroid therapy in first episode of nephrotic syndrome: five to seven months vs three months
Number with frequent relapses by 12 to 24 months · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.73 [0.49, 1.09]6 studies · 706 participantsModerate
Steroid therapy in first episode of nephrotic syndrome: five to seven months vs three months
Number of children relapsing by 12 to 24 months · children with nephrotic syndrome
Corticosteroid therapy for nephrotic syndrome in children (2020) · Cochrane
RR 0.62 [0.45, 0.85]7 studies · 762 participantsLow
Low protein diet vs normal protein diet
Death (all causes) · non‐diabetic adults with CKD
Low protein diets for non‐diabetic adults with chronic kidney disease (2020) · Cochrane
RR 0.77 [0.51, 1.18]5 studies · 1680 participantsModerate
Low protein diet vs normal protein diet
ESKD · non‐diabetic adults with CKD
Low protein diets for non‐diabetic adults with chronic kidney disease (2020) · Cochrane
RR 1.05 [0.73, 1.53]6 studies · 1814 participantsLow
Low protein diet vs normal protein diet
End or change in GFR · non‐diabetic adults with CKD
Low protein diets for non‐diabetic adults with chronic kidney disease (2020) · Cochrane
no estimate extracted8 studies · 1680 participantsVery low
Very low protein diet vs low or normal protein diet
Death (all causes) · non‐diabetic adults with CKD
Low protein diets for non‐diabetic adults with chronic kidney disease (2020) · Cochrane
RR 1.26 [0.62, 2.54]6 studies · 681 participantsModerate
Very low protein diet vs low or normal protein diet
ESKD · non‐diabetic adults with CKD
Low protein diets for non‐diabetic adults with chronic kidney disease (2020) · Cochrane
RR 0.64 [0.49, 0.85]10 studies · 1010 participantsModerate
Very low protein diet vs low or normal protein diet
End or change in GFR · non‐diabetic adults with CKD
Low protein diets for non‐diabetic adults with chronic kidney disease (2020) · Cochrane
no estimate extracted6 studies · 456 participantsLow
Intervention NR
Final body weight: low protein versus normal protein diet · non‐diabetic adults with CKD
Low protein diets for non‐diabetic adults with chronic kidney disease (2020) · Cochrane
no estimate extracted2 studies · 223 participantsVery low
Intervention NR
Final body weight: very low protein diet versus low protein diet · non‐diabetic adults with CKD
Low protein diets for non‐diabetic adults with chronic kidney disease (2020) · Cochrane
no estimate extracted4 studies · 291 participantsVery low
Intervention NR
Protein energy wasting (malnutrition) · non‐diabetic adults with CKD
Low protein diets for non‐diabetic adults with chronic kidney disease (2020) · Cochrane
RR 1.31 [0.42, 4.13]15 studies · 2373 participantsLow
Rituximab vs placebo or control
Relapses at 3 months · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
RR 0.32 [0.14, 0.7]3 studies · 132 participantsModerate
Mycophenolate mofetil vs levamisole
Frequent relapses at 12 months · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
RR 0.88 [0.41, 1.87]1 study · 149 participantsLow
Mycophenolate mofetil vs levamisole
Relapse rate/patient/month · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
no estimate extractedNRNo studies
Mycophenolate mofetil vs levamisole
Adverse effects: peritonitis · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
RR 0.32 [0.03, 3.01]1 study · 149 participantsVery low
Mycophenolate mofetil vs levamisole
Adverse effects: abdominal pain · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
RR 1.26 [0.66, 2.4]1 study · 149 participantsLow
Mycophenolate mofetil vs levamisole
Adverse effects: anaemia · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
RR 0.48 [0.04, 5.18]1 study · 149 participantsVery low
Mycophenolate mofetil vs levamisole
Adverse effects: leukopenia · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
RR 2.88 [0.12, 69.65]1 study · 149 participantsVery low
Mycophenolate mofetil vs cyclosporin
Relapse at 12 months · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
RR 1.9 [0.66, 5.46]2 studies · 82 participantsLow
Mycophenolate mofetil vs cyclosporin
Frequent relapses · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
no estimate extractedNRNo studies
Mycophenolate mofetil vs cyclosporin
Relapse rate/year · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
no estimate extracted3 studies · 3 participantsLow
Mycophenolate mofetil vs cyclosporin
Adverse effects: hypertension · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
RR 0.3 [0.09, 1.07]3 studies · 144 participantsLow
Rituximab vs placebo or control
Relapses at 6 months · SSNS in children
Non‐corticosteroid immunosuppressive medications for steroid‐sensitive nephrotic syndrome in children (2020) · Cochrane
RR 0.23 [0.12, 0.43]5 studies · 269 participantsModerate