Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,771 questions · 10,185 findings · 893 reviews

No studies found 2,109 · 20.7%GRADE not reported 1,125 · 11%Very low 2,279 · 22.4%Low 2,514 · 24.7%Moderate 1,709 · 16.8%High 449 · 4.4%

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Long‐term GnRH agonist therapy vs no additional therapy

Clinical pregnancy rate · patients with endometriosis prior to standard IVF/ICSI

It is very uncertain whether long‐term GnRH agonist therapy changes clinical pregnancy rate compared with no additional therapy (very low certainty).

1 finding from 1 review

Long‐term GnRH agonist therapy vs no additional therapy

Multiple pregnancy rate · patients with endometriosis prior to standard IVF/ICSI

It is very uncertain whether long‐term GnRH agonist therapy changes multiple pregnancy rate compared with no additional therapy (very low certainty).

1 finding from 1 review

Long‐term GnRH agonist therapy vs no additional therapy

Miscarriage · patients with endometriosis prior to standard IVF/ICSI

It is very uncertain whether long‐term GnRH agonist therapy changes miscarriage rate compared with no additional therapy (very low certainty).

1 finding from 1 review

Chemotherapy vs Placebo

Outcome not reported · People receiving curative-intent treatment for oral cavity and oropharyngeal (squamous cell) cancer

The review found no eligible studies for this question.

1 finding from 1 review

Radiotherapy vs control

Progression to visual loss (loss of 3 or more lines on logMAR chart) · people with neovascular AMD

Radiotherapy showed no clear difference in loss of 3 or more lines of best‐corrected visual acuity Measured… compared with control (low certainty).

1 finding from 1 review

Chemotherapy vs placebo, best supportive care (BSC) or no treatment

Overall survival · advanced gastric and oesophago‐gastric junction adenocarcinoma

Chemotherapy probably leads to lower overall survival compared with placebo, best supportive care (BSC) or no treatment (moderate certainty).

1 finding from 1 review

Chemotherapy vs placebo, best supportive care (BSC) or no treatment

Progression‐free survival · advanced gastric and oesophago‐gastric junction adenocarcinoma

Chemotherapy leads to lower progression‐free survival compared with placebo, best supportive care (BSC) or no treatment (high certainty).

1 finding from 1 review