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)

1,105 questions in 84 reviews · Metabolic and Endocrine Disorders

current versions
No studies 434 · 39.3%Ungraded 32 · 2.9%Very low 246 · 22.3%Low 237 · 21.4%Moderate 132 · 11.9%High 24 · 2.2%

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
Insulin detemir vs NPH insulin
Diabetes‐related complications (1) Fatal MI (2) Fatal stroke (3) Progression in retinopathy (4) Amputations (5) ESRD
(Ultra‐)long‐acting insulin analogues versus NPH insulin (human isophane insulin) for adults with type 2… (2020) · Cochrane
RR 1.5 [0.68, 3.32]1 study · 2 participantsVery low
Insulin detemir vs NPH insulin
Hypoglycaemic episodes (1) Severe hypoglycaemia (2) Serious hypoglycaemia (3) Confirmed hypoglycaemia (BG < 75 mg/dL) (4) Confirmed hypoglycaemia (BG < 55 mg/dL) (5) Confirmed nocturnal hypoglycaemia (BG < 75 mg/dL) (6) Confirmed nocturnal hypogly...
(Ultra‐)long‐acting insulin analogues versus NPH insulin (human isophane insulin) for adults with type 2… (2020) · Cochrane
RR 0.45 [0.17, 1.2]1 study · 5 participantsVery low
Intervention NR
Basal calcitonin
Calcitonin testing for detection of medullary thyroid cancer in people with thyroid nodules (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Reported cut‐off value (range 4.6 ‐100 pg/mL)
Calcitonin testing for detection of medullary thyroid cancer in people with thyroid nodules (2020) · Cochrane
no estimate extracted16 studies · 72368 participantsUngraded
Intervention NR
Reported cut‐off value (range basal calcitonin 4.6 pg/mL to 35 pg/mL, range stimulated calcitonin 50 pg/mL to 100 pg/mL)
Calcitonin testing for detection of medullary thyroid cancer in people with thyroid nodules (2020) · Cochrane
no estimate extracted13 studies · 69702 participantsUngraded
Intervention NR
Subgroup analysis
Calcitonin testing for detection of medullary thyroid cancer in people with thyroid nodules (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Cut‐off value
Calcitonin testing for detection of medullary thyroid cancer in people with thyroid nodules (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
pg/mL
Calcitonin testing for detection of medullary thyroid cancer in people with thyroid nodules (2020) · Cochrane
no estimate extracted10 studies · 44393 participantsUngraded
Intervention NR
Gender (basal calcitonin)
Calcitonin testing for detection of medullary thyroid cancer in people with thyroid nodules (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Female
Calcitonin testing for detection of medullary thyroid cancer in people with thyroid nodules (2020) · Cochrane
no estimate extracted6 studies · 14858 participantsUngraded
Intervention NR
Male
Calcitonin testing for detection of medullary thyroid cancer in people with thyroid nodules (2020) · Cochrane
no estimate extracted6 studies · 4339 participantsUngraded
Minimally invasive parathyroidectomy vs bilateral neck exploration
Success rate (eucalcaemia) (a)
Minimally invasive parathyroidectomy guided by intraoperative parathyroid hormone monitoring (IOPTH) and… (2020) · Cochrane
RR 0.98 [0.94, 1.03]5 studies · 266 participantsVery low
Minimally invasive parathyroidectomy vs bilateral neck exploration
Total incidence of perioperative adverse events (number)
Minimally invasive parathyroidectomy guided by intraoperative parathyroid hormone monitoring (IOPTH) and… (2020) · Cochrane
RR 0.5 [0.33, 0.76]5 studies · 236 participantsLow
Minimally invasive parathyroidectomy vs bilateral neck exploration
All‐cause mortality
Minimally invasive parathyroidectomy guided by intraoperative parathyroid hormone monitoring (IOPTH) and… (2020) · Cochrane
no estimate extractedNRVery low
Minimally invasive parathyroidectomy vs bilateral neck exploration
Health‐related quality of life
Minimally invasive parathyroidectomy guided by intraoperative parathyroid hormone monitoring (IOPTH) and… (2020) · Cochrane
no estimate extractedNRVery low
Minimally invasive parathyroidectomy vs bilateral neck exploration
Cosmetic satisfaction
Minimally invasive parathyroidectomy guided by intraoperative parathyroid hormone monitoring (IOPTH) and… (2020) · Cochrane
no estimate extractedNRVery low
Minimally invasive parathyroidectomy vs bilateral neck exploration
Duration of surgery (time from skin incision to skin closure)
Minimally invasive parathyroidectomy guided by intraoperative parathyroid hormone monitoring (IOPTH) and… (2020) · Cochrane
no estimate extracted3 studies · 171 participantsVery low
Minimally invasive parathyroidectomy vs bilateral neck exploration
Length of hospital stay
Minimally invasive parathyroidectomy guided by intraoperative parathyroid hormone monitoring (IOPTH) and… (2020) · Cochrane
no estimate extractedNRNo studies
Summary of findings for resveratrol plus oral anti‐diabetic drugs vs placebo plus oral anti‐diabetic drugs
Diabetes‐related complications
Resveratrol for adults with type 2 diabetes mellitus (2020) · Cochrane
no estimate extractedNRNo studies
Summary of findings for resveratrol plus oral anti‐diabetic drugs vs placebo plus oral anti‐diabetic drugs
All‐cause mortality
Resveratrol for adults with type 2 diabetes mellitus (2020) · Cochrane
no estimate extracted3 studies · 50 participantsVery low
Summary of findings for resveratrol plus oral anti‐diabetic drugs vs placebo plus oral anti‐diabetic drugs
Diabetes‐related mortality
Resveratrol for adults with type 2 diabetes mellitus (2020) · Cochrane
no estimate extracted3 studies · 50 participantsVery low
Summary of findings for resveratrol plus oral anti‐diabetic drugs vs placebo plus oral anti‐diabetic drugs
Health‐related quality of life
Resveratrol for adults with type 2 diabetes mellitus (2020) · Cochrane
no estimate extractedNRNo studies
Summary of findings for resveratrol plus oral anti‐diabetic drugs vs placebo plus oral anti‐diabetic drugs
Adverse events
Resveratrol for adults with type 2 diabetes mellitus (2020) · Cochrane
no estimate extracted3 studies · 50 participantsVery low
Summary of findings for resveratrol plus oral anti‐diabetic drugs vs placebo plus oral anti‐diabetic drugs
HbA1c (%)
Resveratrol for adults with type 2 diabetes mellitus (2020) · Cochrane
no estimate extracted2 studies · 31 participantsVery low
Summary of findings for resveratrol plus oral anti‐diabetic drugs vs placebo plus oral anti‐diabetic drugs
Socioeconomic effects
Resveratrol for adults with type 2 diabetes mellitus (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Healing of rickets (number) Definition: normal alkaline phosphatase and bone radiograph
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
RR 3.26 [1.59, 6.69]1 study · 71 participantsLow
Vitamin D plus calcium vs vitamin D
Adverse events (number) Definition: asymptomatic hypercalcaemia and hypercalciuria
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
RR 4.76 [0.24, 93.19]1 study · 39 participantsVery low
Vitamin D plus calcium vs vitamin D
All‐cause mortality
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extractedNRNo studies
Vitamin D plus calcium vs vitamin D
Health‐related quality of life
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extractedNRNo studies
Vitamin D plus calcium vs vitamin D
Growth pattern
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extracted1 participantsUngraded
Vitamin D plus calcium vs vitamin D
Socioeconomic effects
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extractedNRNo studies
Vitamin D plus calcium vs calcium
Healing of rickets (number) Definition: normal alkaline phosphatase and bone radiograph
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
RR 1.17 [0.72, 1.9]2 studies · 140 participantsVery low
Vitamin D plus calcium vs calcium
Morbidity (number) Definition: fractures
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
RR 0.89 [0.06, 13.76]1 study · 72 participantsVery low
Vitamin D plus calcium vs calcium
Adverse events (number) Asymptomatic hypercalcaemia and hypercalciuria
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
RR 4.29 [0.22, 83.57]1 study · 37 participantsVery low
Vitamin D plus calcium vs calcium
All‐cause mortality
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extractedNRNo studies
Vitamin D plus calcium vs calcium
Health‐related quality of life
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Morbidity (number) Definition: fractures
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
RR 0.27 [0.03, 2.32]1 study · 71 participantsVery low
Vitamin D plus calcium vs calcium
Growth pattern
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extracted1 participantsUngraded
Vitamin D plus calcium vs calcium
Socioeconomic effects
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Adverse events (number)
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
All‐cause mortality
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Health‐related quality of life
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Growth pattern
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extracted1 participantsUngraded
Intervention NR
Socioeconomic effects
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
no estimate extractedNRNo studies
Vitamin D plus calcium vs vitamin D
Healing of rickets (number) Definition: normal alkaline phosphatase and bone radiograph
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
RR 3.06 [1.49, 6.29]1 study · 75 participantsLow
Vitamin D plus calcium vs vitamin D
Morbidity (number) Definition: fractures
Vitamin D, calcium or a combination of vitamin D and calcium for the treatment of nutritional rickets in… (2020) · Cochrane
RR 0.24 [0.03, 2.08]1 study · 75 participantsVery low
Intervention NR
Health‐related quality of life
Non‐nutritive sweeteners for diabetes mellitus (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
NNS versus nutritive, low‐calorie sweetener (tagatose) NNS: sucralose
Non‐nutritive sweeteners for diabetes mellitus (2020) · Cochrane
no estimate extracted1 study · 354 participantsVery low
Intervention NR
Body weight (kg)
Non‐nutritive sweeteners for diabetes mellitus (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
NNS versus placebo NNS: aspartame, rebaudioside A
Non‐nutritive sweeteners for diabetes mellitus (2020) · Cochrane
no estimate extracted2 studies · 184 participantsVery low