Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,410 questions · 8,901 findings · 1,091 reviews

No studies found 1,687 · 19%GRADE not reported 1,469 · 16.5%Very low 1,969 · 22.1%Low 2,060 · 23.1%Moderate 1,302 · 14.6%High 414 · 4.7%

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Lower lip bumper vs No active treatment (control)

Amount of crowding · Children or adolescents (aged 16 years old or under) receiving orthodontic treatment to prevent or correct crowded teeth

It is very uncertain whether lower lip bumper changes amount of crowding (change in mandibular incisor crowding) at 6 months compared with no active treatment (control) (very low certainty).

1 finding from 1 review

Low‐cavity forceps vs any vacuum cup

Third‐ or fourth‐degree perineal tear (with or without episiotomy) · Women in the second stage of labour, requiring an assisted vaginal birth

It is very uncertain whether low‐cavity forceps changes third‐ or fourth‐degree perineal tear (with or without episiotomy) compared with any vacuum cup (very low certainty).

1 finding from 1 review

Low‐cavity forceps vs any vacuum cup

Failed delivery with allocated instrument (primary) · Women in the second stage of labour, requiring an assisted vaginal birth

It is very uncertain whether low‐cavity forceps changes failed delivery with allocated instrument (primary) compared with any vacuum cup (very low certainty).

1 finding from 1 review

Low‐cavity forceps vs any vacuum cup

Any maternal trauma (primary) · Women in the second stage of labour, requiring an assisted vaginal birth

It is very uncertain whether low‐cavity forceps changes any maternal trauma (primary) compared with any vacuum cup (very low certainty).

1 finding from 1 review