Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

472 questions · 487 findings · 38 reviews · Developmental, Psychosocial and Learning Problems

No studies found 153 · 31.4%GRADE not reported 18 · 3.7%Very low 184 · 37.8%Low 88 · 18.1%Moderate 42 · 8.6%High 2 · 0.4%

Parent‐ and clinician‐mediated intervention vs clinician‐mediated intervention alone

Expressive language (number of words; standard scores; MLUw; NDW; IPSyn; frequency of unique targets; % target talk) · children with Down syndrome aged between birth and six years
1 finding from 1 review

Summary of findings: Picture Exchange Communication System (PECS) vs treatment

Spoken communication Measured by: frequency of speech, including non‐word vocalisations (expressed as rates per minute)a · minimally verbal children with autism spectrum disorder

It is very uncertain whether summary of findings: Picture Exchange Communication System (PECS) changes spoken communication Measured by: frequency of speech, including… compared with treatment (very low certainty).

1 finding from 1 review

Summary of findings: Picture Exchange Communication System (PECS) vs treatment

Non‐verbal communication/AAC Measured by: frequency of use of PECS symbols (expressed as rates per minute)a · minimally verbal children with autism spectrum disorder

It is very uncertain whether summary of findings: Picture Exchange Communication System (PECS) changes non‐verbal communication/AAC Measured by: frequency of use of PECS… compared with treatment (very low certainty).

1 finding from 1 review

Summary of findings: Picture Exchange Communication System (PECS) vs treatment

Combined spoken and non‐verbal communication/AAC · minimally verbal children with autism spectrum disorder

It is very uncertain whether summary of findings: Picture Exchange Communication System (PECS) changes combined spoken and non‐verbal communication/AAC Measured by: verbal… compared with treatment (very low certainty).

1 finding from 1 review

Summary of findings: Picture Exchange Communication System (PECS) vs treatment

Social communication and pragmatic language skills · minimally verbal children with autism spectrum disorder

It is very uncertain whether summary of findings: Picture Exchange Communication System (PECS) changes social communication or pragmatic language Measured by: reciprocal… compared with treatment (very low certainty).

1 finding from 1 review