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Table 1 Data collection flow chart

From: Helmet continuous positive airway pressure versus high-flow nasal cannula in COVID-19: a pragmatic randomised clinical trial (COVID HELMET)

Timing

Method

Data type and specification

At screening

eCRF (RedCap)

Inclusion and exclusion criteria and informed consent

At randomisation

eCRF (RedCap)

Allocation, treatment limitations (i.e. ICU admission), weight, height, place of birth, smoking, date of symptom start, gender, clinical frailty scale, mode of respiratory support, SpO2%, litres O2/min, RR/min and NEWS

One hour post randomisation

CRF paper

SpO2/FiO2-ratio

24 h post randomisation

CRF paper

Patient comfort (visual analogue scale (VAS) 1–10)

Daily for 28 days

CRF paper

Mode of respiratory support, number of hours per 24 h in allocated support, nr of hours in prone position per 24 h, NEWS, PEEP or Flow, SpO2%, RR/min and events with commentary (e.g. allocation violation, death, exit from study, ICU admission or hospital discharge)

Retrospectively from electronic medical charts

eCRF (RedCap)

Comorbidities, vitals, medications, radiology, microbiology and laboratory parameters at triage, randomisation and during hospital stay, and, duration of hospital stay, duration of ICU stay, duration of mechanical ventilation and days alive within 28 and 180 days, respectively.

  1. Abbreviations: eCRF electronic case report form, ICU intensive care unit, SpO2% peripheral oxygen saturation, L O2/min litres of oxygen per minute, RR respiratory rate, NEWS national early warning score, FiO2 fraction of inspired oxygen, PEEP positive end-expiratory pressure