Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

374 questions · 393 findings · 47 reviews · Headline outcomes only

No studies found 73 · 18.6%GRADE not reported 16 · 4.1%Very low 164 · 41.7%Low 85 · 21.6%Moderate 36 · 9.2%High 19 · 4.8%

Intervention not reported

Immediate change in level in year 2000 (noise level at work as PEL dose in dB(A); range 0 to 6400, log scale) · workers with noise exposure
1 finding from 1 review

Intervention not reported

Change in slope after introduction (noise level at work as PEL dose in dB(A); range 0 to 6400, log scale) · workers with noise exposure
1 finding from 1 review

Effects of extensive instructions vs simple instructions

PAR pass rate (%) ‐ Fit testing of foam earplugs (immediate) · workers exposed to noise using HPDs

Effects of extensive instructions probably leads to higher PAR pass rate (%) ‐ Fit testing of foam earplugs (immediate) compared with simple instructions (moderate certainty).

1 finding from 1 review