Table 2 Clinical Diagnosis Definitions

Upper respiratory tract disease (URTD)

• Nasal congestion, rhinorrhoea or a sore throat.

Lower respiratory tract disease (LRTD)

• One or more of the following:

○ Wheezing or silent chest (in the setting of obstruction) at the time of recording

○ Any auscultatory findings, including crackles, bronchial breath sounds, or focally decreased breath sounds

○ Increased work of breathing unless purely associated with stridor

○ A productive cough > 5 days

○ New consolidation, infiltrate or pleural effusion on CXR

Asthma/RAD

• Wheeze or silent chest at the time of recording

• Responsive to bronchodilators during this illness

• Diagnosis is Unsure if:

○ No bronchodilator test^a administered

○ Pre-treated with bronchodilators with wheeze resolved at the time of recording

Bronchiolitis

• Age < 24 months

• Must have both:

o A persistent cough and

o Diffuse wheeze that is non-responsive to bronchodilator (if administered) and/or diffuse crackles

Pneumonia (Focal)

At least one feature from both of the following categories:

1. History of: (i) fever in prior 48 h or fever at the time of examination, (ii) cough, (iii) dyspnoea, or (iv) chest pain

2. Either focal^b examination findings including crackles, bronchial breath sounds, focal decreased breath sounds; OR

A chest radiograph with new consolidation with normal auscultation findings

Croup

• Typical seal-like barking cough on the cough recording.