Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

564 questions · 589 findings · 155 reviews · Headline outcomes only

No studies found 114 · 19.4%GRADE not reported 15 · 2.5%Very low 179 · 30.4%Low 141 · 23.9%Moderate 110 · 18.7%High 30 · 5.1%

Serotonin and noradrenaline reuptake inhibitors (SNRI) vs placebo

Participant‐reported sleep problems (scale: 0 to 28; higher scores indicate more sleep problems) · patients with fibromyalgia

Serotonin noradrenaline reuptake inhibitors showed no clear difference in self‐reported sleep problems (0‐100 scale) Higher scores indicate… compared with placebo (low certainty).

1 finding from 1 review

Serotonin and noradrenaline reuptake inhibitors (SNRI) vs placebo

Self‐reported health‐related quality of life (0‐100 scale) Higher scores indicate higher burden of disease (lower quality of life) · patients with fibromyalgia

Serotonin noradrenaline reuptake inhibitors showed no clear difference in self‐reported health‐related quality of life (0‐100 scale) Higher… compared with placebo (low certainty).

1 finding from 1 review

Intervention not reported

Invitation versus control: uptake of screening · women for cervical screening

The intervention probably leads to higher invitation versus control: uptake of screening (moderate certainty).

1 finding from 1 review

Intervention not reported

GP invitation letter versus invitation letter from other authority sources: uptake of screening · women for cervical screening

It is very uncertain whether the intervention changes GP invitation letter versus invitation letter from other authority… (very low certainty).

1 finding from 1 review

Intervention not reported

Personal invitation versus invitation letter: uptake of screening · women for cervical screening

The intervention may leads to higher personal invitation versus invitation letter: uptake of screening (low certainty).

1 finding from 1 review