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 failure | 10 (5–18) | 7 (3–17) | 13 (9–18) | <0.001 |
| Length of stay for NIV set-up following an elective admission | 3 (2–4) | 2 (2–3) | 4 (3–4) | <0.001 |
| Interface, n (%) | ||||
| Full face mask | 1355 (77.6) | 882 (78.9) | 473 (75.3) | <0.001 |
| Nasal mask | 238 (13.6) | 115 (10.3) | 123 (19.6) | |
| Nasal pillows | 64 (3.7) | 33 (3) | 31 (4.9) | |
| Total face mask | 47 (2.7) | 47 (4.2) | 0 (0) | |
| Not available | 42 (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 support | 1405 (80.5) | 859 (76.8) | 546 (86.9) | <0.001 |
| Pressure control | 179 (10.3) | 144 (12.9) | 35 (5.6) | |
| Spontaneous | 89 (5.1) | 82 (7.3) | 7 (1.1) | |
| Pressure support with target volume | 40 (2.3) | 11 (1) | 29 (4.6) | |
| Not available | 33 (1.9) | 22 (2) | 11 (1.8) | |
| Settings | ||||
| Positive inspiratory pressure (cmH2O) | 22±5 | 23±5 | 19±4 | <0.001 |
| Positive expiratory pressure (cmH2O) | 7±3 | 8±4 | 7±2 | <0.001 |
| Pressure support (cmH2O) | 14±5 | 15±5 | 12±3 | <0.001 |
| Backup rate (per minute) | 13.2±2.5 | 13.4±2.8 | 12.8±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.