Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

99 questions · 102 findings · 10 reviews · Headline outcomes only

No studies found 2 · 2%GRADE not reported 22 · 21.6%Very low 41 · 40.2%Low 15 · 14.7%Moderate 12 · 11.8%High 10 · 9.8%

Group B antipsychotic drugs: olanzapine + supportive intervention vs placebo or supportive treatment

Prodromal symptoms: transition to psychosis Endpoint data (events) · people in the prodromal stage of psychosis

It is very uncertain whether group B antipsychotic drugs: olanzapine + supportive intervention changes prodromal symptoms: transition to psychosis Endpoint data, (events)… compared with placebo + supportive intervention (very low certainty).

1 finding from 1 review

Group B antipsychotic drugs: olanzapine + supportive intervention vs placebo or supportive treatment

Satisfaction and acceptability of treatment (medium term) ‐ leaving the study early · people in the prodromal stage of psychosis

It is very uncertain whether group B antipsychotic drugs: olanzapine + supportive intervention changes satisfaction with treatment: leaving the study early Endpoint data… compared with placebo + supportive intervention (very low certainty).

1 finding from 1 review

Group C cognitive behavioural therapy: cognitive behavioural therapy + supportive intervention vs non‐directive reflective listening + supportive intervention

Prodromal symptoms: transition to psychosis Endpoint data (events) · people in the prodromal stage of psychosis

It is very uncertain whether group C cognitive behavioural therapy: cognitive behavioural therapy… changes prodromal symptoms: transition to psychosis Endpoint data (events) compared with non‐directive reflective listening + supportive intervention (very low certainty).

1 finding from 1 review

Group C cognitive behavioural therapy: cognitive behavioural therapy + supportive intervention vs non‐directive reflective listening + supportive intervention

Satisfaction with treatment: leaving the study early Endpoint data (events) · people in the prodromal stage of psychosis

It is very uncertain whether group C cognitive behavioural therapy: cognitive behavioural therapy… changes satisfaction with treatment: leaving the study early Endpoint data… compared with non‐directive reflective listening + supportive intervention (very low certainty).

1 finding from 1 review