Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

267 questions · 280 findings · 47 reviews

No studies found 80 · 28.6%GRADE not reported 11 · 3.9%Very low 96 · 34.3%Low 50 · 17.9%Moderate 40 · 14.3%High 3 · 1.1%

Increased vs stable doses of inhaled corticosteroids

Treatment failure ‐ need for systemic corticosteroids (ITT) · adults and children with chronic asthma

Increased showed no clear difference in treatment failure: need for systemic corticosteroids (ITT) compared with stable doses of inhaled corticosteroids (moderate certainty).

1 finding from 1 review

Increased vs stable doses of inhaled corticosteroids

Treatment failure ‐ need for systemic corticosteroids (of those starting inhaler) · adults and children with chronic asthma

It is very uncertain whether increased changes treatment failure: need for systemic corticosteroids (of those… compared with stable doses of inhaled corticosteroids (very low certainty).

1 finding from 1 review

Increased vs stable doses of inhaled corticosteroids

Unscheduled physician visits 44 weeks · adults and children with chronic asthma

Increased showed no clear difference in unscheduled physician visits 44 weeks compared with stable doses of inhaled corticosteroids (low certainty).

1 finding from 1 review

Increased vs stable doses of inhaled corticosteroids

Serious adverse events 48 weeks · adults and children with chronic asthma

It is very uncertain whether increased changes serious adverse events 48 weeks compared with stable doses of inhaled corticosteroids (very low certainty).

1 finding from 1 review

Increased vs stable doses of inhaled corticosteroids

Non‐serious adverse events 43 weeks · adults and children with chronic asthma

It is very uncertain whether increased changes non‐serious adverse events 43 weeks compared with stable doses of inhaled corticosteroids (very low certainty).

1 finding from 1 review

Abundant water intake vs standard water intake

Stone recurrence (assessed as symptomatic renal colic/stone expulsion episodes and imaging) · participants with a prior history of nephrolithiasis

Increased water intake may leads to lower stone recurrence (assessed as symptomatic renal colic/stone… compared with standard water intake (low certainty).

1 finding from 1 review

Abundant water intake vs standard water intake

Time to recurrence · participants with a prior history of nephrolithiasis

Increased water intake may leads to lower time to recurrence (absolute event rate based on 5‐year compared with standard water intake (low certainty).

1 finding from 1 review

Electronic cigarette use vs Non-smokers (non-users)

Oral microbiota composition (dysbiosis; increased periodontal/opportunistic pathogens) · Adult e-cigarette (ENDS) users (general oral health; predominantly natural dentition)

E-cigarette use is associated with oral microbiota dysbiosis and increased pathogenic bacteria compared with non-smokers (narrative synthesis; ungraded).

1 finding from 1 review

Postbiotic toothpaste vs Fluoride toothpaste alone

Increased salivary IgA · children aged 6‐12 years

Postbiotics increase salivary IgA (immune modulation) in human trials (ungraded narrative synthesis).

1 finding from 1 review
  • Postbiotics and Dental Caries: A Systematic Review. 2025 All outcomes
    Daily for 14 days to 4 weeks · Clinical; salivary/plaque sampling
    Postbiotic toothpaste significantly increased salivary IgA versus fluoride toothpaste (Basir 2022); the review also cites Lin 2022 for postbiotic immune modulation/IgA; no pooled estimate.
    1 study
    GRADE not reported