Table 2

Comparison of non-invasive ventilation set-up and setting between London and Rouen

Total population
(N=1746)
London population (n=1118)Rouen population (n=628)P value
NIV set-up following an acute respiratory failure (yes), n (%)824 (48.6)444 (53.9)380 (60.5)<0.001
Length of stay for NIV set-up following an acute respiratory failure10 (5–18)7 (3–17)13 (9–18)<0.001
Length of stay for NIV set-up following an elective admission3 (2–4)2 (2–3)4 (3–4)<0.001
Interface, n (%)
 Full face mask1355 (77.6)882 (78.9)473 (75.3)<0.001
 Nasal mask238 (13.6)115 (10.3)123 (19.6)
 Nasal pillows64 (3.7)33 (3)31 (4.9)
 Total face mask47 (2.7)47 (4.2)0 (0)
 Not available42 (2.4)41 (3.7)1 (0.2)
Life support NIV (yes)*, n (%)609 (34.9)515 (46.1)94 (15)<0.001
 NIV mode, n (%)
 Pressure support1405 (80.5)859 (76.8)546 (86.9)<0.001
 Pressure control179 (10.3)144 (12.9)35 (5.6)
 Spontaneous89 (5.1)82 (7.3)7 (1.1)
 Pressure support with target volume40 (2.3)11 (1)29 (4.6)
 Not available33 (1.9)22 (2)11 (1.8)
Settings
 Positive inspiratory pressure (cmH2O)22±523±519±4<0.001
 Positive expiratory pressure (cmH2O)7±38±47±2<0.001
 Pressure support (cmH2O)14±515±512±3<0.001
 Backup rate (per minute)13.2±2.513.4±2.812.8±1.6<0.001
 Additional oxygen (yes), n (%)634 (36.3)247 (22.1)241 (38.4)<0.001
  • Results are expressed in terms of mean and SD or median and IQR for continuous variable and in frequency for categorical values.

  • *Defined by a ventilator with built-in battery and approved for invasive ventilation.

  • NIV, non-invasive ventilation.