Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

2,262 questions · 2,405 findings · 248 reviews · Headline outcomes only

No studies found 507 · 21.1%GRADE not reported 93 · 3.9%Very low 657 · 27.3%Low 708 · 29.4%Moderate 387 · 16.1%High 53 · 2.2%

Lay health worker‐led psychological interventions vs usual care

Severity of CMD symptoms (including anxiety and depression) ‐ intermediate term (1 to 6 months post intervention) Measured by PHQ‐9a,d,f; SRQ‐20b (higher score, higher severity) · adults with common mental disorders
1 finding from 1 review

Lay health worker‐led psychological interventions vs usual care

Prevalence of PTSD · adults with post‐traumatic stress and CMDs

It is very uncertain whether lay health worker‐led psychological interventions changes prevalence of PTSD ‐ intermediate term (1 to 6 months) Diagnosis… compared with usual care (very low certainty).

1 finding from 1 review

Lay health worker‐led psychological interventions vs usual care

PTS symptoms ‐ intermediate term (1 to 6 months post intervention) PCL‐5a,d,e; PCL‐6f; Post‐traumatic Stress Diagnostic Scaleb (higher score = higher severity) · adults with post‐traumatic stress and CMDs
1 finding from 1 review

Lay health worker‐led psychological interventions vs usual care

Depression symptoms ‐ intermediate term (1 to 6 months post intervention) GHQ‐12a; PHQ‐9d,e,f; self‐reporting questionnaireh (higher score = higher severity) · adults with post‐traumatic stress and CMDs
1 finding from 1 review

Lay health worker‐led psychological interventions vs usual care

Quality of life ‐ intermediate term (1 to 6 months post intervention) EQ‐5Di; SF‐36c,m; WHOQOL‐BREFe,j,n (higher score = better quality of life) · adults with post‐traumatic stress and CMDs
1 finding from 1 review

Lay health worker‐led psychological interventions vs usual care

Hospital admissions · adults with post‐traumatic stress and CMDs

It is very uncertain whether lay health worker‐led psychological interventions changes service utilisation ‐ hospital admissions (1 to 6 months post… compared with usual care (very low certainty).

1 finding from 1 review

Primary health professional‐led psychological interventions vs usual care or no treatment

Prevalence of adults with probable PTSD (1 to 6 months post intervention) Diagnosis defined by HTQ ≥ 1.75 (RR > 1 denotes lower prevalence compared to control) · adults with post‐traumatic stress or common mental disorders

Primary health professional‐led psychological interventions may leads to higher prevalence of adults with probable PTSD (1 to 6 months post… compared with usual or no care (low certainty).

1 finding from 1 review

Primary health professional‐led psychological interventions vs usual care or no treatment

Anxiety and depression · adults with post‐traumatic stress or common mental disorders

Primary health professional‐led psychological interventions may leads to higher prevalence of adults with probable depression or anxiety (1 to 6… compared with usual or no care (low certainty).

1 finding from 1 review

Primary health professional‐led psychological interventions vs usual care or no treatment

Severity of PTSD symptoms · adults with post‐traumatic stress or common mental disorders

It is very uncertain whether primary health professional‐led psychological interventions changes PTS symptoms (1 to 6 months post intervention) Harvard Trauma… compared with usual or no care (very low certainty).

1 finding from 1 review

Primary health professional‐led psychological interventions vs usual care or no treatment

Depression symptoms (1 to 6 months post intervention) Hopkins Symptom Checklist ‐ depression (higher score = higher severity) · adults with post‐traumatic stress or common mental disorders

It is very uncertain whether primary health professional‐led psychological interventions changes depression symptoms (1 to 6 months post intervention) Hopkins… compared with usual or no care (very low certainty).

1 finding from 1 review

Primary health professional‐led psychological interventions vs usual care or no treatment

Functional impairment · adults with post‐traumatic stress or common mental disorders

It is very uncertain whether primary health professional‐led psychological interventions changes functional impairment (1 to 6 months post intervention) Locally… compared with usual or no care (very low certainty).

1 finding from 1 review

Primary health professional‐led psychological interventions vs usual care or no treatment

Adverse events (RR > 1 denotes greater risk of harm) · adults with post‐traumatic stress or common mental disorders

It is very uncertain whether primary health professional‐led psychological interventions changes adverse events (RR > 1 denotes greater risk of harm) compared with usual or no care (very low certainty).

1 finding from 1 review

Lay health worker‐led interventions for adult patients with harmful or hazardous alcohol or substance use vs enhanced usual care

Clinical recovery ‐ harmful or hazardous alcohol use (1 to 6 months post intervention) · adult patients with harmful or hazardous alcohol or substance use

Lay health worker‐led interventions for adult patients with harmful… showed no clear difference in clinical recovery ‐ harmful or hazardous alcohol use (1 to 6 months… compared with enhanced usual care (low certainty).

1 finding from 1 review