| Study period | ||||||
---|---|---|---|---|---|---|---|
 | Enrolment | Allocation | Post-allocation | ||||
Time point | 0–5 min | 5–10 min | 10–60 min | 1–5 h | 1–29 days | 30 days | 30–37 days |
Enrolment | |||||||
 Eligibility screen | X |  |  |  |  |  |  |
 Informed consent | X |  |  |  | X |  |  |
 Allocation |  | X |  |  |  |  |  |
Interventions | |||||||
 CPAP |  |  | X |  |  |  |  |
 Standard oxygen therapy |  |  | X |  |  |  |  |
Assessments | |||||||
 Patient characteristics | X | X | X |  |  |  |  |
 ED physiology and treatments |  |  |  | X |  |  |  |
 Hospital treatments |  |  |  |  | X |  |  |
 Clinical outcomes |  |  |  |  |  | X |  |
 Quality of life and health resource use |  |  |  |  |  |  | X |