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Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

236 questions · 242 findings · 34 reviews · Headline outcomes only

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No studies found 85 · 35.1%GRADE not reported 4 · 1.7%Very low 58 · 24%Low 52 · 21.5%Moderate 36 · 14.9%High 7 · 2.9%

Intervention not reported

Anxiety and depression disorders · adults over 18 years with tinnitus

The review found no eligible studies for this question.

1 finding from 1 review

Intervention not reported

Psychoacoustic parameters · adults over 18 years with tinnitus

The review found no eligible studies for this question.

1 finding from 1 review

Intervention not reported

Tinnitus loudness (dB) · adults over 18 years with tinnitus

It is very uncertain whether the intervention changes tinnitus loudness (dB) (very low certainty).

1 finding from 1 review

Intervention not reported

Duration of cold symptoms (days) · patients with common cold
1 finding from 1 review

Intervention not reported

Severity of symptom score · patients with common cold
1 finding from 1 review

Intervention not reported

Incidence of common cold · patients with common cold

It is very uncertain whether the intervention changes incidence of common cold (very low certainty).

1 finding from 1 review
  • Zinc for the common cold 2013 · Cochrane Headline outcomes only
    RR 0.64 [0.47, 0.88]
    2 studies · 394 participants
    Very low

Intervention not reported

Number of participants symptomatic after 7 days of treatment · patients with common cold

It is very uncertain whether the intervention changes number of participants symptomatic after 7 days of treatment (very low certainty).

1 finding from 1 review

Intervention not reported

School absence (number of days) · patients with common cold
1 finding from 1 review
  • Zinc for the common cold 2013 · Cochrane Headline outcomes only
    no estimate extracted
    2 studies · 394 participants
    Very low

Intervention not reported

Antibiotic use · patients with common cold

The intervention may leads to lower antibiotic use (low certainty).

1 finding from 1 review

Intervention not reported

Any adverse event · patients with common cold

The intervention led to higher any adverse event; GRADE not reported.

1 finding from 1 review
  • Zinc for the common cold 2013 · Cochrane Headline outcomes only
    OR 1.58 [1.19, 2.09]
    8 studies · 1217 participants
    GRADE not reported