| Berkenbosch et al (2001) | Paediatric trauma, ARDS | 25 | 4 Hours | 0.02 (3.27) |
| Chakravarthy et al (2010) | Ventilator weaning in cardiosurgery | 32 | 4 Hours | -1.3 (7.80) |
| Cox et al(2006) | NIV for COPD exacerbations | 22 | 4 hours | -0.15 (0.75) |
| Cuvelier et al (2005) | Long-term home NIV | 12 | 40 minutes | -0.72 (2.98) |
| Gancel et al (2011) | Acute resp.failure in ED | 29 | 2 hours | 0.01 (0.81) |
| Hazenburg et al (2011) | Chronic resp.failure | 15 | 8 hours | 0.40 (0.87) |
| Janssens et al (1998) | NIV in ICU | 26 | 4 hours | 0.10 (0.69) |
| Janssens et al (2001) | NIV in ICU | 28 | 8 hours | -2.8(3.8) |
| Johnson et al (2008) | Tracheostomised patients | 41 | 10 hours | 0.07 (0.55) |
| Kelly and Klim (2011) | Acute resp.failure in ED | 46 | Single | 0.81 (1.87) |
| Nicolini and Ferrari (2011) | Acute resp failure requiring NIV | 80 | 10 minutes | 0.11 (0.73) |
| Paiva et al (2009) | Chronic resp.failure | 65 | 6 hours | 1.00 (5.20) |
| Parker and Gibson (2007) | Routine resp.practice | 48 | 10 minutes | -0.04 (1.34) |
| Sivan et al (1992) | Paediatric resp.failure | 134 | Single | 0.17 (1.92) |
| Storre et al (2007) | NIV titration | 10 | 4 hours | 0.61 (1.15) |
| Storre (2011) | Nocturnal NIV in chronic resp.failure | 24 | 8 hours | 0.11 (1.00) |