Figure 3.

Extended nomogram predicting respiratory dysfunction at 6 months post-discharge, including also respiratory rate (breaths/min) and degree of dyspnea, quantified through the modified Medical Research Council score (mMRC), at 1 month post-discharge. mMRC scores: 0, no dyspnea; 1, mild dyspnea; 2, moderate dyspnea; 3, severe dyspnea; 4, very severe dyspnea. BMI, body mass index; COPD, chronic obstructive pulmonary disease; PaO₂/FiO₂, ratio of arterial oxygen partial pressure in mmHg to fractional inspired oxygen expressed as a fraction; NIV, non-invasive ventilation; RR, respiratory rate.