Study	Reason for exclusion
Elkins 2004	This trial did not compare NIV to increase minute ventilation and is not linked to the outcome measures in this review.
Falk 2006	This trial did not use NIV.
Fauroux 2000a	This trial did not compare NIV with other management for acute or chronic respiratory failure.
Fauroux 2000b	This trial is not comparing NIV with other management strategies for acute or chronic respiratory failure.
Fauroux 2001	This is not a randomised controlled trial of NIV versus no NIV.
Fauroux 2004	This trial did not compare NIV with other management for acute or chronic respiratory failure.
Greenough 2004	This trial did not use NIV.
Parreira 2008	This trial did not use NIV pressure or volume preset mode.
Piper 1992	This is not a randomised controlled trial.
Regnis 1994	This is not a randomised controlled trial.
Riethmueller 2006	This trial did not use NIV.
Serra 2000	This is not a randomised controlled trial of NIV versus no NIV.
Serra 2002	This is not a randomised controlled trial of NIV versus no NIV.

see Table 1