Table 1 Inclusion and exclusion criteria

Population

• Paediatric patients

• Studies with adult and paediatric patient populations if they report the data separately for adults and children

• Adult population

• Studies with adult and paediatric patient populations if paediatric data could not be separated from adults

• Studies not reporting the age of the patients

Epidemiologic outcomes

• Causes of nasal obstruction

• Available treatments for nasal obstruction

• Articles without relevant outcomes data

• Genetic profiling studies

• Palliative care studies

Study design

• Cohort studies

• Case-control studies

• Cross-sectional studies

• Randomised controlled trials

• Database studies

• Case series

• Letters to the editor

• Narrative reviews

• Editorials

• Expert opinions

• Case studies

Year of publication

Inception to 16 January 2021

Studies published after 16 January 2021

Language

English language

Non-English language

Filters applied

Human, paediatric