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)

37 questions in 13 reviews · Hypertension

current versions
No studies 37 · 100%Ungraded 0 · 0%Very low 0 · 0%Low 0 · 0%Moderate 0 · 0%High 0 · 0%

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
Evening vs morning dosing regimen
Cardiovascular mortality (time points not specified) · adults with primary (essential) hypertension whose systolic or diastolic (or both) blood pressure levels were 130/80…
Evening versus morning dosing regimen drug therapy for hypertension (2024) · Cochrane
no estimate extractedNRNo studies
Evening vs morning dosing regimen
Cardiovascular morbidity (stroke, myocardial infarction, congestive heart failure, aortic aneurysm) (time points not specified) · adults with primary (essential) hypertension whose systolic or diastolic (or both) blood pressure levels were 130/80…
Evening versus morning dosing regimen drug therapy for hypertension (2024) · Cochrane
no estimate extractedNRNo studies
First‐line thiazides vs first‐line ACE inhibitors
Total serious adverse events · adults with hypertension
First‐line diuretics versus other classes of antihypertensive drugs for hypertension (2023) · Cochrane
no estimate extractedNRNo studies
First‐line thiazides vs first‐line beta‐blockers
Total serious adverse events · adults with hypertension
First‐line diuretics versus other classes of antihypertensive drugs for hypertension (2023) · Cochrane
no estimate extractedNRNo studies
First‐line thiazides vs first‐line alpha‐blockers
Total serious adverse events · adults with hypertension
First‐line diuretics versus other classes of antihypertensive drugs for hypertension (2023) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Pravastatin 10 to 80 mg/day (6 to 156 weeks) · participants with normal or abnormal lipid profiles
Pravastatin for lowering lipids (2023) · Cochrane
no estimate extractedNRNo studies
Calcium supplementation/fortification vs control
Adverse events (secondary outcome) · People who may be at risk for primary hypertension
Calcium supplementation for prevention of primary hypertension (2022) · Cochrane
no estimate extractedNRNo studies
Intensive periodontal treatment (subgingival SRP with or without other periodontal treatment) vs Supra-gingival scaling
Proportion of participants diagnosed with hypertension at trial completion · Adults (any age/sex) with chronic periodontitis (>=5 teeth remaining; PPD >4 mm), with or without hypertension
Effect of periodontal treatments on blood pressure (2021) · Cochrane
No included study in this comparison reported the proportion of participants diagnosed with hypertension at trial completion.NRNo studies
Intensive periodontal treatment (subgingival SRP with or without other periodontal treatment) vs Supra-gingival scaling
Heart rate · Adults (any age/sex) with chronic periodontitis (>=5 teeth remaining; PPD >4 mm), with or without hypertension
Effect of periodontal treatments on blood pressure (2021) · Cochrane
Heart rate was reported only by Higashi 2009 (periodontal treatment vs no treatment); no study in the intensive-treatment vs supra-gingival-scaling comparison reported heart rate.NRNo studies
Periodontal treatment (subgingival SRP with or without other periodontal treatment) vs No treatment (no periodontal treatment)
Proportion of participants diagnosed with hypertension at trial completion · Adults (any age/sex) with chronic periodontitis (>=5 teeth remaining; PPD >4 mm), with or without hypertension
Effect of periodontal treatments on blood pressure (2021) · Cochrane
No included study reported the proportion of participants diagnosed with hypertension at trial completion.NRNo studies
Roselle extract vs placebo
Withdrawals due to adverse effects · hypertension in adults with type 2 diabetes mellitus
Roselle for hypertension in adults (2021) · Cochrane
no estimate extractedNRNo studies
Roselle extract vs placebo
Change** in pulse pressure (mmHg) · hypertension in adults with type 2 diabetes mellitus
Roselle for hypertension in adults (2021) · Cochrane
no estimate extractedNRNo studies
Roselle extract vs placebo
Change** in heart rate (beats/min) · hypertension in adults with type 2 diabetes mellitus
Roselle for hypertension in adults (2021) · Cochrane
no estimate extractedNRNo studies
Weight‐reducing diets vs no weight‐reducing diets
Adverse events · Men and non‐pregnant women ≥ 18 years old with essential hypertension
Long‐term effects of weight‐reducing diets in people with hypertension (2021) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Acronyms and grades · Male participants
Effect of atorvastatin on testosterone levels (2021) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Acronyms and grades · Adult female participants with PCOS
Effect of atorvastatin on testosterone levels (2021) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Cerivastatin dose · participants with normal or abnormal lipid profiles
Cerivastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
CI: confidence interval · participants with normal or abnormal lipid profiles
Cerivastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
aMean baseline values. · participants with normal or abnormal lipid profiles
Cerivastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Cerivastatin dose · participants with normal or abnormal lipid profiles
Cerivastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
CI: confidence interval · participants with normal or abnormal lipid profiles
Cerivastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
aMean baseline values. · participants with normal or abnormal lipid profiles
Cerivastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Cerivastatin dose · participants with normal or abnormal lipid profiles
Cerivastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Discontinuation by no treatment/placebo of antihypertensives vs continuation
Falls ‐ not reported · Older adults, 50 years and older
Withdrawal of antihypertensive drugs in older people (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
pitavastatin dose · participants with normal or abnormal lipid profiles
Pitavastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
CI: Confidence interval · participants with normal or abnormal lipid profiles
Pitavastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
aMean baseline values. · participants with normal or abnormal lipid profiles
Pitavastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Pitavastatin dose · participants with normal or abnormal lipid profiles
Pitavastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
CI: Confidence interval · participants with normal or abnormal lipid profiles
Pitavastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
aMean baseline values. · participants with normal or abnormal lipid profiles
Pitavastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
CI: Confidence interval · participants with normal or abnormal lipid profiles
Pitavastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
aMean baseline values. · participants with normal or abnormal lipid profiles
Pitavastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Pitavastatin dose · participants with normal or abnormal lipid profiles
Pitavastatin for lowering lipids (2020) · Cochrane
no estimate extractedNRNo studies
Intervention NR
CI: Confidence interval · participants with normal or abnormal lipid profiles
Fluvastatin for lowering lipids (2018) · Cochrane
no estimate extractedNRNo studies
Intervention NR
CI: Confidence interval · participants with normal or abnormal lipid profiles
Fluvastatin for lowering lipids (2018) · Cochrane
no estimate extractedNRNo studies
Intervention NR
CI: Confidence interval · participants with normal or abnormal lipid profiles
Fluvastatin for lowering lipids (2018) · Cochrane
no estimate extractedNRNo studies
Intervention NR
Angiotensin‐converting enzyme inhibitor · children (from 1 to 18 years of age) with hypertension from primary or secondary causes
Pharmacological interventions for hypertension in children (2014) · Cochrane
no estimate extractedNRNo studies