Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,760 questions · 8,065 findings · 1,036 reviews

No studies found 1,686 · 20.9%GRADE not reported 675 · 8.4%Very low 1,953 · 24.2%Low 2,048 · 25.4%Moderate 1,296 · 16.1%High 407 · 5%

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LABA/ICS vs LAMA

Moderate to severe exacerbations: low‐risk population · chronic obstructive pulmonary disease with predicted FEV1 of less than 80%

LABA/ICS showed no clear difference in moderate to severe exacerbations: low‐risk population compared with LAMA (low certainty).

1 finding from 1 review

LABA/ICS vs LABA

Moderate to severe exacerbations: low‐risk population · chronic obstructive pulmonary disease with predicted FEV1 of less than 80%

LABA/ICS probably leads to lower moderate to severe exacerbations: low‐risk population compared with LABA (moderate certainty).

1 finding from 1 review

LAMA vs LABA

Moderate to severe exacerbations: low‐risk population · chronic obstructive pulmonary disease with predicted FEV1 of less than 80%

LAMA showed no clear difference in moderate to severe exacerbations: low‐risk population compared with LABA (moderate certainty).

1 finding from 1 review

LABA/LAMA vs LABA plus inhaled corticosteroid (ICS)

Severe exacerbations: low‐risk population · chronic obstructive pulmonary disease with predicted FEV1 of less than 80%

LABA/LAMA showed no clear difference in severe exacerbations: low‐risk population compared with LABA/ICS (moderate certainty).

1 finding from 1 review

LABA/LAMA vs LABA plus inhaled corticosteroid (ICS)

Pneumonia: low‐risk population · chronic obstructive pulmonary disease with predicted FEV1 of less than 80%

LABA/LAMA probably leads to lower pneumonia: low‐risk population compared with LABA/ICS (moderate certainty).

1 finding from 1 review

LABA/LAMA vs LAMA

Moderate to severe exacerbations: low‐risk population · chronic obstructive pulmonary disease with predicted FEV1 of less than 80%

LABA/LAMA showed no clear difference in moderate to severe exacerbations: low‐risk population compared with LAMA (low certainty).

1 finding from 1 review

Lower lip bumper vs No active treatment (control)

Lower incisors to mandible (position, mm) at 9 months · Children or adolescents (aged 16 years old or under) receiving orthodontic treatment to prevent or correct crowded teeth

Lower lip bumper led to higher lower incisors to mandible at 6 months compared with no active treatment (control); GRADE not reported.

1 finding from 1 review

Lower lip bumper vs No active treatment (control)

Size of the lower jaw (arch length) · Children or adolescents (aged 16 years old or under) receiving orthodontic treatment to prevent or correct crowded teeth

Lower lip bumper led to higher size of the lower jaw (mandibular arch length) at 6 months compared with no active treatment (control); GRADE not reported.

1 finding from 1 review

Lower lip bumper vs No active treatment (control)

Lower molars to mandible (relationship of lower back teeth to the mandible) · Children or adolescents (aged 16 years old or under) receiving orthodontic treatment to prevent or correct crowded teeth

Lower lip bumper led to lower lower molars to mandible at 6 months compared with no active treatment (control); GRADE not reported.

1 finding from 1 review

Lower lingual arch vs No active treatment (control)

Size of the lower jaw (arch length) · Children or adolescents (aged 16 years old or under) receiving orthodontic treatment to prevent or correct crowded teeth

Lower lingual arch led to higher size of the lower jaw (mandibular arch length) at 1 year compared with no active treatment (control); GRADE not reported.

1 finding from 1 review

Lower lingual arch vs No active treatment (control)

Lower incisors to mandible (position, mm) at 9 months · Children or adolescents (aged 16 years old or under) receiving orthodontic treatment to prevent or correct crowded teeth

Lower lingual arch led to higher lower incisors to mandible at 1 year compared with no active treatment (control); GRADE not reported.

1 finding from 1 review

Lower lingual arch vs No active treatment (control)

Lower molars to mandible (relationship of lower back teeth to the mandible) · Children or adolescents (aged 16 years old or under) receiving orthodontic treatment to prevent or correct crowded teeth

Lower lingual arch led to lower lower molars to mandible at 1 year compared with no active treatment (control); GRADE not reported.

1 finding from 1 review

Lower vs higher oxygen concentrations titrated to target oxygen saturations during resuscitation of preterm infants at birth

Mortality, near term corrected age or discharge · preterm infants

Lower showed no clear difference in mortality, near term corrected age or discharge compared with higher oxygen concentrations titrated to target oxygen saturations… (low certainty).

1 finding from 1 review