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Evidence found and GRADE certainty

2,038 questions · 2,118 findings · 339 reviews

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No studies found 323 · 15.3%GRADE not reported 166 · 7.8%Very low 552 · 26.1%Low 592 · 28%Moderate 340 · 16.1%High 145 · 6.8%

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

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

Neurodevelopmental disability · preterm infants

Lower showed no clear difference in neurodevelopmental disability compared with higher oxygen concentrations titrated to target oxygen saturations… (low certainty).

1 finding from 1 review

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

Intubation in the delivery room · preterm infants

Lower showed no clear difference in intubation in the delivery room compared with higher oxygen concentrations titrated to target oxygen saturations… (low certainty).

1 finding from 1 review

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

Severe (defined as stage 3 or greater) retinopathy of prematurity ‐ not reported · preterm infants

Lower showed no clear difference in severe retinopathy of prematurity (≥ stage 3) compared with higher oxygen concentrations titrated to target oxygen saturations… (low certainty).

1 finding from 1 review

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

Severe intraventricular haemorrhage · preterm infants

Lower showed no clear difference in severe intraventricular haemorrhage (grade 3 or 4) compared with higher oxygen concentrations titrated to target oxygen saturations… (low certainty).

1 finding from 1 review

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

Necrotising enterocolitis · preterm infants

Lower showed no clear difference in necrotising enterocolitis compared with higher oxygen concentrations titrated to target oxygen saturations… (low certainty).

1 finding from 1 review

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

Chronic lung disease · preterm infants

It is very uncertain whether lower changes chronic lung disease (36 weeks' corrected age) compared with higher oxygen concentrations titrated to target oxygen saturations… (very low certainty).

1 finding from 1 review

Upper clear plastic retainer + lower fixed canine-to-canine retainer vs Upper clear plastic retainer + lower interproximal reduction (adjunctive), no lower retainer

Stability: Little's Irregularity Index (lower arch) · People who had received fixed appliance orthodontic treatment

Upper clear plastic retainer + lower fixed canine-to-canine retainer showed no clear difference in stability: Little's Irregularity Index (lower arch) compared with upper clear plastic retainer + lower interproximal reduction…; GRADE not reported.

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 cumulative dose dexamethasone regimen

Death or bronchopulmonary dysplasia at 36 weeks PMA · preterm infants at risk for bronchopulmonary dysplasia

Lower showed no clear difference in death or bronchopulmonary dysplasia at 36 weeks PMA compared with higher cumulative dose dexamethasone regimen (low certainty).

1 finding from 1 review

Lower vs higher cumulative dose dexamethasone regimen

Death or cerebral palsy at 1 to 3 years · preterm infants at risk for bronchopulmonary dysplasia

Lower showed no clear difference in death or cerebral palsy at 1 to 3 years compared with higher cumulative dose dexamethasone regimen (low certainty).

1 finding from 1 review

Lower vs higher cumulative dose dexamethasone regimen

Death or abnormal neurodevelopmental outcome (various definitions) · preterm infants at risk for bronchopulmonary dysplasia

It is very uncertain whether lower changes death or abnormal neurodevelopmental outcome (various definitions)… compared with higher cumulative dose dexamethasone regimen (very low certainty).

1 finding from 1 review