Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

394 questions · 412 findings · 112 reviews

No studies found 51 · 12.4%GRADE not reported 41 · 10%Very low 86 · 20.9%Low 121 · 29.4%Moderate 84 · 20.4%High 29 · 7%

Embryo culture with low oxygen concentration vs embryo culture with atmospheric oxygen concentration

Clinical pregnancy rate · Patients with clinical pregnancy rate

Embryo culture with low oxygen concentration probably leads to higher clinical pregnancy rate compared with embryo culture with atmospheric oxygen concentration (moderate certainty).

1 finding from 1 review

Embryo culture with low oxygen concentration vs embryo culture with atmospheric oxygen concentration

Multiple pregnancy rate · Patients with multiple pregnancy rate

Embryo culture with low oxygen concentration showed no clear difference in multiple‐pregnancy rate compared with embryo culture with atmospheric oxygen concentration (low certainty).

1 finding from 1 review

Embryo culture with low oxygen concentration vs embryo culture with atmospheric oxygen concentration

Miscarriage · patients with miscarriage rate

Embryo culture with low oxygen concentration showed no clear difference in miscarriage rate compared with embryo culture with atmospheric oxygen concentration (low certainty).

1 finding from 1 review

Embryo culture with low oxygen concentration vs embryo culture with atmospheric oxygen concentration

Congenital abnormalities · patients with congenital abnormalities

It is very uncertain whether embryo culture with low oxygen concentration changes congenital abnormalities compared with embryo culture with atmospheric oxygen concentration (very low certainty).

1 finding from 1 review

Hyperbaric oxygen vs air breathing to enhance the effectiveness of radiotherapy

Failure of local tumour control ‐ not reported · People undergoing radiation therapy for head and neck cancer

Hyperbaric oxygen probably leads to lower failure of local tumour control (local control) compared with air breathing to enhance the effectiveness of radiotherapy (moderate certainty).

1 finding from 1 review