Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,230 questions · 1,303 findings · 326 reviews · Headline outcomes only

No studies found 73 · 5.6%GRADE not reported 21 · 1.6%Very low 497 · 38.1%Low 403 · 30.9%Moderate 245 · 18.8%High 64 · 4.9%

Omega‐3 vs placebo

Mental state: psychotic symptoms Average total score (PANSS, higher score = worse, scale from 30‐210) Long‐term (up to 7 years) · people in the prodromal stage of psychosis
1 finding from 1 review

Psychological therapies vs controls

Responder rate (achievement of at least 50% reduction in migraine frequency) Higher numbers mean more people responded · adults with migraine

It is very uncertain whether psychological therapies changes responder rate (achievement of at least 50% reduction in migraine… compared with controls (very low certainty).

1 finding from 1 review