Variables used to stratify subjects for randomisation
| Stratification criteria | Minimisation variable |
|---|---|
| Gender | Male/female |
| Home mechanical ventilation centre | London (LFU STH) UK |
| London (RBH) UK | |
| Leeds UK | |
| Grenoble FRANCE | |
| Rouen—FRANCE | |
| Geneva SWITZERLAND | |
| Use of acute NIV or acute or long-term CPAP in past 3 months | Yes/no |
CPAP, continuous positive airway pressure; LFU STH, Lane Fox Unit, St Thomas's Hospital; NIV, non-invasive ventilation; RBH, Royal Brompton Hospital.