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)

2,653 questions in 194 reviews · Gynaecology and Fertility

current versions
No studies 531 · 20%Ungraded 76 · 2.9%Very low 826 · 31.1%Low 855 · 32.2%Moderate 341 · 12.9%High 24 · 0.9%

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
Tibolone vs placebo
Cerebrovascular events (all doses) · postmenopausal women with or without vasomotor symptoms
Short‐term and long‐term effects of tibolone in postmenopausal women (2016) · Cochrane
OR 1.74 [0.99, 3.04]4 studies · 7930 participantsVery low
Tibolone vs placebo
Mortality from any cause (all doses) · postmenopausal women with or without vasomotor symptoms
Short‐term and long‐term effects of tibolone in postmenopausal women (2016) · Cochrane
OR 1.06 [0.79, 1.41]4 studies · 8242 participantsLow
Tibolone vs combined HT
Vasomotor symptoms (tibolone 2.5 mg/d) · postmenopausal women with vasomotor symptoms
Short‐term and long‐term effects of tibolone in postmenopausal women (2016) · Cochrane
OR 1.57 [1.18, 2.1]4 studies · 646 participantsModerate
Intervention NR
Live Birth Rate · Subfertile women undergoing in vitro maturation
Human chorionic gonadotrophin priming for fertility treatment with in vitro maturation (2016) · Cochrane
OR 0.65 [0.24, 1.74]1 study · 82 participantsLow
Intervention NR
Miscarriage Rate · Subfertile women undergoing in vitro maturation
Human chorionic gonadotrophin priming for fertility treatment with in vitro maturation (2016) · Cochrane
OR 0.6 [0.21, 1.72]2 studies · 282 participantsLow
Intervention NR
Clinical Pregnancy Rate · Subfertile women undergoing in vitro maturation
Human chorionic gonadotrophin priming for fertility treatment with in vitro maturation (2016) · Cochrane
OR 0.52 [0.26, 1.03]2 studies · 282 participantsLow
Intervention NR
Adverse events and drug reactions · Subfertile women undergoing in vitro maturation
Human chorionic gonadotrophin priming for fertility treatment with in vitro maturation (2016) · Cochrane
no estimate extractedNRNo studies
Chinese herbal medicine (CHM) vs placebo
Vasomotor SymptomsFrequency of hot flushes measured in a diary (daily) · women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
no estimate extracted2 studies · 199 participantsModerate
CHM vs HT
Outcomesa · Women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
no estimate extractedNRNo studies
CHM vs HT
Vasomotor Symptoms measured by Menopause Specific Quality of Life Questionnaire (MENQOL, monthly) · Women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
no estimate extracted2 studies · 127 participantsVery low
CHM vs HT
Adverse Effects · Women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
RR 0.96 [0.66, 1.39]6 studies · 864 participantsVery low
Chinese herbal medicine (CHM) vs placebo
Vasomotor SymptomsSeverity of hot flushes measured in a diary (daily) · women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
no estimate extracted1 study · 108 participantsModerate
Chinese herbal medicine (CHM) vs placebo
Vasomotor SymptomsOverall scores of hot flushes in a diary (daily) · women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
no estimate extracted3 studies · 263 participantsLow
Chinese herbal medicine (CHM) vs placebo
Vasomotor SymptomsOverall scores of hot flushes in a diary (monthly) · women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
no estimate extracted1 study · 84 participantsVery low
Chinese herbal medicine (CHM) vs placebo
Vasomotor SymptomsOverall night sweats in a diary (daily) · women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
no estimate extracted1 study · 64 participantsLow
Chinese herbal medicine (CHM) vs placebo
Vasomotor SymptomsOverall scores of night sweats in a diary (monthly) · women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
no estimate extracted1 study · 84 participantsVery low
Chinese herbal medicine (CHM) vs placebo
Vasomotor Symptomsmeasured by the Kupperman Index (KI, monthly) · women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
no estimate extracted1 study · 69 participantsLow
Chinese herbal medicine (CHM) vs placebo
Vasomotor Symptomsmeasured by Menopause Specific Quality of Life Questionnaire (MENQOL, monthly) · women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
no estimate extracted3 studies · 256 participantsLow
Chinese herbal medicine (CHM) vs placebo
Adverse Effects · women with menopausal symptoms
Chinese herbal medicine for menopausal symptoms (2016) · Cochrane
RR 1.51 [0.69, 3.33]7 studies · 705 participantsVery low
Transdermal beta‐estradiol patch vs placebo
Frequency of hot flushes Beta‐estradiol patch 0.0375‐0.10 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted4 studies · 793 participantsLow
Intranasal beta‐estradiol vs placebo
Frequency of hot flushes Change from baseline Intranasal beta‐estradiol 0.021 mg/day, 0.029 mg/day or 0.040 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted1 study · 458 participantsModerate
Intranasal beta‐estradiol vs placebo
Adverse effects Intranasal beta‐estradiol 0.021 mg/day, 0.029 mg/day or 0.040 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
OR 1.96 [1.26, 3.03]1 study · 458 participantsModerate
Transdermal beta‐estradiol patch vs conjugated equine estrogens
Frequency of hot flushes Beta‐estradiol patch 0.05 or 0.1 mg per day vs CEE 0.625 or 1.25 mg per day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted2 studies · 711 participantsLow
Transdermal beta‐estradiol patch vs conjugated equine estrogens
Adverse events Beta‐estradiol patch 0.05 or 0.1 mg/day vs CEE 0.625 or 1.25 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted2 studies · 711 participantsVery low
Oral beta‐estradiol vs conjugated equine estrogens
Frequency of hot flushes Oral beta‐estradiol 1.0 and 2.0 mg/day vs CEE 0.625 or 1.25 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted1 study · 102 participantsVery low
Oral beta‐estradiol vs conjugated equine estrogens
Adverse events Oral beta‐estradiol 1.0 or 2.0 mg/day vs CEE 0.625 or 1.25 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted1 study · 103 participantsVery low
Transdermal beta‐estradiol patch vs placebo
Intensity of hot flushes Beta‐estradiol patch 0.025‐0.05 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted2 studies · 393 participantsLow
Transdermal beta‐estradiol patch vs placebo
Adverse effects Beta‐estradiol patch dose 0.10 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
OR 2.14 [1.29, 3.54]9 studies · 1822 participantsLow
Transdermal beta‐estradiol gel vs placebo
Frequency of hot flushes Beta‐estradiol gel 0.27‐1.5 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted3 studies · 930 participantsLow
Transdermal beta‐estradiol gel vs placebo
Adverse effects Beta‐estradiol gel dose 1.5 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted3 studies · 1086 participantsModerate
Oral beta‐estradiol vs placebo
Frequency of hot flushes Oral beta‐estradiol 0.5‐1.0 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted2 studies · 356 participantsLow
Oral beta‐estradiol vs placebo
Adverse effects Oral beta‐estradiol 0.5‐2.0 mg/day · women with hot flushes
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted3 studies · 433 participantsLow
Topical beta‐estradiol emulsion vs placebo
Frequency of vasomotor menopausal symptoms Micellar nanoparticle beta‐estradiol 8.6 mg/day · women with vasomotor symptoms
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
no estimate extracted1 study · 200 participantsLow
Topical beta‐estradiol emulsion vs placebo
Adverse effects Micellar nanoparticle beta‐estradiol 8.6 mg/day · women with vasomotor symptoms
Bioidentical hormones for women with vasomotor symptoms (2016) · Cochrane
OR 1.46 [0.8, 2.66]1 study · 200 participantsLow
Psychological and educational interventions vs attentional control or usual care
Anxiety Different scales for anxiety (low score indicates benefit from intervention) · Subfertile men and women
Psychological and educational interventions for subfertile men and women (2016) · Cochrane
no estimate extracted21 studies · 2372 participantsVery low
Psychological and educational interventions vs attentional control or usual care
Depression Different scales for depression (low score indicates benefit from intervention) · Subfertile men and women
Psychological and educational interventions for subfertile men and women (2016) · Cochrane
no estimate extracted15 studies · 1464 participantsVery low
Psychological and educational interventions vs attentional control or usual care
Live birth or ongoing pregnancy (complete‐case analysis) · Subfertile men and women
Psychological and educational interventions for subfertile men and women (2016) · Cochrane
no estimate extracted3 studies · 387 participantsVery low
NSAIDs vs placebo
Pain relief dichotomous data · women with primary dysmenorrhoea
Nonsteroidal anti‐inflammatory drugs for dysmenorrhoea (2015) · Cochrane
OR 4.37 [3.76, 5.09]NRLow
NSAIDs vs placebo
All adverse effects · women with primary dysmenorrhoea
Nonsteroidal anti‐inflammatory drugs for dysmenorrhoea (2015) · Cochrane
OR 1.29 [1.11, 1.51]NRLow
NSAIDs vs paracetamol
Pain relief dichotomous data · women with primary dysmenorrhoea
Nonsteroidal anti‐inflammatory drugs for dysmenorrhoea (2015) · Cochrane
OR 1.89 [1.05, 3.43]NRLow
NSAIDs vs paracetamol
All adverse effects ‐ ibuprofen versus paracetamol · women with primary dysmenorrhoea
Nonsteroidal anti‐inflammatory drugs for dysmenorrhoea (2015) · Cochrane
OR 0.85 [0.31, 2.34]NRVery low
Misoprostol vs placebo or no treatment before operative hysteroscopy
Ease of dilatation: need for mechanical dilatation · Pre and post menopausal women
Preoperative ripening of the cervix before operative hysteroscopy (2015) · Cochrane
OR 0.08 [0.04, 0.16]5 studies · 441 participantsModerate
Misoprostol vs dinoprostone before operative hysteroscopy
Side effects · Pre and post menopausal women
Preoperative ripening of the cervix before operative hysteroscopy (2015) · Cochrane
no estimate extractedNRLow
Misoprostol vs osmotic dilator before operative hysteroscopy
Ease of dilatation: need for mechanical dilatation · Pre and post menopausal women
Preoperative ripening of the cervix before operative hysteroscopy (2015) · Cochrane
OR 5.96 [2.61, 13.59]1 study · 110 participantsLow
Misoprostol vs osmotic dilator before operative hysteroscopy
Intraoperative complications · Pre and post menopausal women
Preoperative ripening of the cervix before operative hysteroscopy (2015) · Cochrane
OR 5.14 [0.24, 109.01]3 studies · 354 participantsLow
Misoprostol vs placebo or no treatment before operative hysteroscopy
Intraoperative complications · Pre and post menopausal women
Preoperative ripening of the cervix before operative hysteroscopy (2015) · Cochrane
OR 0.37 [0.18, 0.77]12 studies · 901 participantsModerate
Misoprostol vs placebo or no treatment before operative hysteroscopy
Specific intraoperative complications ‐ Cervical laceration/tear · Pre and post menopausal women
Preoperative ripening of the cervix before operative hysteroscopy (2015) · Cochrane
OR 0.25 [0.11, 0.57]9 studies · 669 participantsModerate
Misoprostol vs placebo or no treatment before operative hysteroscopy
Specific intraoperative complications ‐ False track · Pre and post menopausal women
Preoperative ripening of the cervix before operative hysteroscopy (2015) · Cochrane
OR 0.34 [0.12, 0.97]7 studies · 560 participantsModerate
Misoprostol vs placebo or no treatment before operative hysteroscopy
Specific intraoperative complications ‐ Uterine perforation · Pre and post menopausal women
Preoperative ripening of the cervix before operative hysteroscopy (2015) · Cochrane
OR 0.42 [0.13, 1.38]7 studies · 455 participantsLow
Misoprostol vs placebo or no treatment before operative hysteroscopy
Specific intraoperative complications ‐ Uterine bleeding · Pre and post menopausal women
Preoperative ripening of the cervix before operative hysteroscopy (2015) · Cochrane
OR 0.51 [0.1, 2.49]4 studies · 340 participantsLow