Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,730 questions · 18,059 findings · 1,282 reviews

No studies found 4,360 · 24.1%GRADE not reported 2,529 · 14%Very low 4,641 · 25.7%Low 4,007 · 22.2%Moderate 2,057 · 11.4%High 465 · 2.6%

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Systemic corticosteroids plus intranasal steroid/mucolytic/decongestant vs no intervention

Psychophysical testing for recovery of sense of smell · adults with olfactory dysfunction for ≥ 4 weeks following COVID‐19 infection

It is very uncertain whether systemic corticosteroids plus intranasal… changes psychophysical testing for recovery of sense of smell compared with no intervention (very low certainty).

1 finding from 1 review

Palmitoylethanolamide and luteolin vs no intervention

Recovery of sense of smell (as · adults with olfactory dysfunction for ≥ 4 weeks following COVID‐19 infection

It is very uncertain whether palmitoylethanolamide and luteolin changes recovery of sense of smell (as compared with no intervention (very low certainty).

1 finding from 1 review

Intranasal steroid spray vs placebo or no intervention

Presence of normal olfactory function · people with olfactory dysfunction for less than 4 weeks following COVID‐19 infection

It is very uncertain whether intranasal steroid spray changes presence of normal olfactory function Assessed by participants as a… compared with no intervention/placebo (very low certainty).

2 findings from 1 review