Fig. 3
Respiratory function tests plotted against the proportion of patients with an NIV indication within the following 3 months. a FVC: Forced Vital Capacity (% predicted value), n = 72; b PCF: Peak Cough Flow (L/min), n = 24; c MIP: Maximum Inspiratory Pressure (cm H2O), n = 70; d MEP: Maximum Expiratory Pressure (cm H2O), n = 70; e SNIP: Sniff Nasal Inspiratory Pressure (cm H2O), n = 38. NIV: Non-invasive ventilation. For example, 15% of the patients had a PCF of 386 L/min or more in the 3 months before their NIV indication