Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,199 questions · 1,226 findings · 451 reviews

No studies found 289 · 23.6%GRADE not reported 121 · 9.9%Very low 350 · 28.5%Low 279 · 22.8%Moderate 139 · 11.3%High 48 · 3.9%

Zinc vs placebo

Adverse events · Patients with taste disturbances (dysgeusia/hypogeusia; idiopathic, zinc-deficient, or secondary to chronic renal failure)

It is very uncertain whether zinc supplements (zinc sulphate, zinc gluconate, zinc picolinate,… changes adverse events compared with placebo (very low certainty).

1 finding from 1 review

SPT performed by non-specialist clinicians (general dental practitioners under specialist prescription) vs SPT performed by specialists (specialist practice)

Adverse events · Adults treated for periodontitis and receiving supportive periodontal therapy (SPT)

The review found no eligible studies for this question.

1 finding from 1 review

Comprehensive geriatric assessment (CGA) vs usual care

Serious adverse events (falls) Median · older people at risk of poor health outcomes

It is very uncertain whether comprehensive Geriatric Assessment changes serious adverse events (falls) Median compared with usual care (very low certainty).

1 finding from 1 review

Preformed metal crown (stainless steel), conventional technique vs Aesthetic crown (stainless steel with composite/white veneer), conventional technique

Adverse events: bone resorption · Children with decayed primary molar teeth
1 finding from 1 review
  • Preformed crowns for decayed primary molar teeth 2015 · Cochrane All outcomes
    Six months and four years
    Bone resorption: one case at six months in a tooth treated with a veneer crown; no bone resorption at either the veneer crown or stainless steel sites at four-year follow-up (Analysis 3.2).
    1 study · 11 participants
    Very low

Pregabalin vs placebo at end of treatment

Withdrawals due to adverse events · patients with fibromyalgia

Pregabalin leads to higher withdrawal due to adverse events compared with placebo at end of treatment (high certainty).

1 finding from 1 review

Hall technique vs Non-restorative caries treatment

Adverse events: gingival bleeding · Children with decayed primary molar teeth

It is very uncertain whether preformed metal crown (fitted using the Hall Technique) changes adverse events: gingival bleeding compared with non-restorative caries treatment (very low certainty).

1 finding from 1 review

Preconception lifestyle advice on weight vs usual care or attention control

Adverse events ‐ Gestational diabetes · women with infertility and obesity

It is very uncertain whether preconception lifestyle advice on weight changes adverse events ‐ Gestational diabetes compared with routine care or attention control (very low certainty).

1 finding from 1 review

Preformed metal crown (stainless steel), conventional technique vs Aesthetic crown (stainless steel with composite/white veneer), conventional technique

Adverse events: gingival bleeding · Children with decayed primary molar teeth
1 finding from 1 review
  • Preformed crowns for decayed primary molar teeth 2015 · Cochrane All outcomes
    Six months and four years
    At six months, none (0/11) of the PMC sites had gingival bleeding, but all (11/11) veneer sites had bleeding, 10 of which bled on probing; statistically significant (McNemar's test, P < 0.001). At four years, one case…
    1 study · 11 participants
    Very low