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(n = 137)
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No. of females (%)
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62 (45%)
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Age (years)
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67.0 ± 7.8
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Body-mass index (kg/m2)
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27.9 ± 8.2
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Smoking status (n; active:prior)
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29:108
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(%; active:prior)
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21.2:78.8
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Smoking index (Pack Years)
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56.3 ± 24.9
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Time under NIV (years)
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2.1 ± 2.6
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Supplemental Oxygen (n; yes:no)
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117: 22
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(%; yes:no)
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84.2:15.8
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LTOT (l/min during rest; n = 117)
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2.1 ± 0.8
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NIV initiation
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Chronic elective NIV
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59 (43%)
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Following acute NIV
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73 (53%)
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NIV following prolonged weaning
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5 (4%)
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Ventilator settings
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IPAP (cmH2O)
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23.6 ± 4.6
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EPAP (cmH2O)
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5.9 ± 1.3
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BF (per minute)
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16.5 ± 2.4
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Adherence (mean hours per day)
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6.5 ± 3.1
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Compliance* (n; compliant: not compliant)
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109:28
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(%; compliant, not compliant)
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79.6:20.4
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- No.: Number; LTOT: long-term oxygen therapy; IPAP: inspiratory positive airway pressure; EPAP: expiratory positive airway pressure; BF: breathing frequency; NIV: non-invasive ventilation; * Patients were defined as non-compliant if NIV use was less than 4 h/day
