Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

149 questions · 167 findings · 20 reviews

No studies found 36 · 21.6%GRADE not reported 39 · 23.4%Very low 54 · 32.3%Low 33 · 19.8%Moderate 5 · 3%High 0 · 0%

Summary of findings: bilateral laminotomy vs conventional laminectomy

Disability Long‐term (≥ 12 months) Disability scores converted to 0 to 100 scale to allow for comparison of different disability scales (RMDQ, ODI, JOA) · patients with lumbar stenosis

It is very uncertain whether summary of findings: bilateral laminotomy changes standardized Disability Index (0 to 100) Bilateral laminotomy… compared with conventional laminectomy (very low certainty).

1 finding from 1 review

Summary of findings: bilateral laminotomy vs conventional laminectomy

Satisfactory recovery Bilateral laminotomy compared with conventional laminectomy Satisfactory recovery was defined as 'good' or 'excellent' self‐perceived recovery · patients with lumbar stenosis

Summary of findings: bilateral laminotomy may leads to higher satisfactory recovery Bilateral laminotomy compared with… compared with conventional laminectomy (low certainty).

1 finding from 1 review

Summary of findings: bilateral laminotomy vs conventional laminectomy

VAS leg (0 to 10) Bilateral laminotomy compared with conventional laminectomy · patients with lumbar stenosis

It is very uncertain whether summary of findings: bilateral laminotomy changes VAS leg (0 to 10) Bilateral laminotomy compared with conventional… compared with conventional laminectomy (very low certainty).

1 finding from 1 review

Adenoidectomy and bilateral ventilation tubes vs bilateral ventilation tubes only

Hearing ‐ return to normal *Ventilation tubes versus laser myringotomy (6 to 12 months ‐ medium‐term) Adjusted for non‐independence of within‐individual measurements Assumed ICC of 0.5 № of participants: 132 (2 RCTs) · children aged 6 months to 12 years with otitis media with effusion (OME)

It is very uncertain whether adenoidectomy and bilateral ventilation tubes changes hearing: return to normal hearing at 6 to 9 months № of… compared with bilateral ventilation tubes only (very low certainty).

1 finding from 1 review

Adenoidectomy and bilateral ventilation tubes vs bilateral ventilation tubes only

Presence/persistence of OME · children aged 6 months to 12 years with otitis media with effusion (OME)

It is very uncertain whether adenoidectomy and bilateral ventilation tubes changes presence/persistence of OME ‐ over 12 months № of participants: 254… compared with bilateral ventilation tubes only (very low certainty).

1 finding from 1 review

Adenoidectomy and bilateral ventilation tubes vs bilateral ventilation tubes only

Specific adverse events: haemorrhage · children aged 6 months to 12 years with otitis media with effusion (OME)

Adenoidectomy and bilateral ventilation tubes showed no clear difference in adverse event: haemorrhage № of participants: 791(2 RCTs) compared with bilateral ventilation tubes only (low certainty).

1 finding from 1 review