Fig. 1

Diagnostic groups of all 815 NIV and LTOT patients on January 1st 2018. NIV, non-invasive ventilation; LTOT, long-term oxygen treatment; COPD, chronic obstructive pulmonary disease; NMD, neuromuscular disease; RCWD, restrictive chest wall disease; OHS, obesity-hypoventilation syndrome; ILD, interstitial lung disease; Misc, miscellaneous