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Table 1 Patient characteristics and NIV data

From: Living conditions and autonomy levels in COPD patients receiving non-invasive ventilation: impact on health related quality of life

(n = 137)
No. of females (%) 62 (45%)
Age (years) 67.0 ± 7.8
Body-mass index (kg/m2) 27.9 ± 8.2
Smoking status (n; active:prior) 29:108
(%; active:prior) 21.2:78.8
Smoking index (Pack Years) 56.3 ± 24.9
Time under NIV (years) 2.1 ± 2.6
Supplemental Oxygen (n; yes:no) 117: 22
(%; yes:no) 84.2:15.8
 LTOT (l/min during rest; n = 117) 2.1 ± 0.8
NIV initiation  
 Chronic elective NIV 59 (43%)
 Following acute NIV 73 (53%)
 NIV following prolonged weaning 5 (4%)
Ventilator settings  
 IPAP (cmH2O) 23.6 ± 4.6
 EPAP (cmH2O) 5.9 ± 1.3
 BF (per minute) 16.5 ± 2.4
 Adherence (mean hours per day) 6.5 ± 3.1
 Compliance* (n; compliant: not compliant) 109:28
 (%; compliant, not compliant) 79.6:20.4
  1. 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