In recurrent croup, the referral delay predicts the whole course

Design

retrospective cohort study, level of evidence III, with correlation and t-test analyses against a standardised social determinants index

Population

70 children aged 0 to 18 evaluated by otolaryngology for recurrent croup at a tertiary children's hospital, 2011 to 2024

Primary outcome

disease duration, emergency department visits, corticosteroid prescriptions and age at resolution

Effect

shorter first-visit-to-ENT interval correlated with fewer emergency visits (r=0.28, P<0.02), fewer corticosteroid courses (r=0.28, P<0.02) and shorter disease duration (r=0.51, P<0.0001)

Recurrent croup is the presentation where a child is repeatedly treated for a viral illness that may not be one. This retrospective cohort reviewed all 70 children aged 0 to 18 evaluated by otolaryngology for recurrent croup at a tertiary children's hospital between 2011 and 2024, linking clinical records to state-standardised Childhood Opportunity Index scores across three domains and fourteen subdomains.

Household tobacco exposure and gastro-oesophageal reflux disease were both associated with earlier onset of croup (P<0.05). Higher wealth, health resource and educational resource scores correlated with shorter disease duration, fewer emergency department visits and younger age at resolution. And the referral interval mattered: a shorter time from first emergency visit to otolaryngology evaluation correlated with fewer emergency visits (r=0.28, P<0.02), fewer corticosteroid prescriptions (r=0.28, P<0.02) and shorter disease duration (r=0.51, P<0.0001).

Correlation is doing a lot of work here and the direction of causation is genuinely uncertain - children referred quickly may simply be the ones whose families could navigate the system, which is the same axis the opportunity index is measuring. But the clinical inference survives either reading. A second or third presentation with croup is the point at which airway evaluation should be arranged rather than the point at which another course of dexamethasone is given, because subglottic stenosis, laryngomalacia and reflux are all findable and treatable. Asking about household smoking at that visit is free and is one of the two modifiable associations in the paper.

• Refer for airway evaluation at the second or third croup presentation rather than after the fifth.
• Ask about household tobacco exposure explicitly and record the answer - it was associated with earlier onset.
• Consider gastro-oesophageal reflux in a child with recurrent croup; it was the other modifiable association.
• Treat repeated corticosteroid courses as a signal that the diagnosis needs revisiting, not as management.
• Level 3 retrospective evidence in 70 children with correlations, not causal estimates - referral timing may be a marker of access as much as a cause of outcome.

The statistics, in plain English

Correlation coefficients of 0.28 explain under 8% of the variance in emergency visits and corticosteroid courses - real, but weak. The 0.51 for disease duration is stronger and is the finding to lean on. All of them are vulnerable to the same confounder: families with more resources both get referred faster and have shorter disease courses, and the Childhood Opportunity Index results in the same paper show exactly that gradient. A retrospective cohort of 70 children evaluated over 13 years also selects for those who reached an otolaryngologist at all, so this cannot describe what happens to children who never do.

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