Study	Reason for exclusion
Albernaz 2007	Allocation: Randomised Participants: Adults
Anolik 2008	Allocation: Randomised Participants: Adults and adolescents (age: ≥ 12) and did not report separate data for children
Barnes 2006	Allocation: Randomised Participants: The participants were between 16 and 75 years
Benincasa 1994	Allocation: Randomised Participants: This study included patients between 12 and 80 years old and did not provide separate data for children
Berger 1999	Allocation: Randomised Participants: The participants were between 12 and 80 years and did not match our inclusion criteria
Chao 2003	This is a conference abstract. The abstract does not provide details of the methodology or age of the participants and we were unable to contact the authors to request further details.
Cox 1997	This is a conference abstract. The abstract claims it to be a randomised controlled trial performed in children but did not provide details on the methods of the study or outcomes.
D'Ambrosio 1998	Allocation: Randomised Participants: This trial included participants who were 16 to 39 years and separate data for children were not available
Di Lorenzo 2004	This is a conference abstract. The abstract does not provide details of the methodology or age of the participants and we were unable to contact the authors to request further details.
Drouin 1995	Allocation: Randomised Participants: This study includes adults not children
Filipovic 2001	This is a conference abstract. The abstract does not provide details of the methodology or age of the participants and we were unable to contact the authors to request further details.
Gupta 1999	Allocation: Randomised Participants: The age range of the male patients was between 10 and 64 years and the female patients between 12 and 58 years Interventions: Comparing different nasal steroid sprays
Juniper 1989	Allocation: Randomised Participants: The participants were over 18 years and did not match our inclusion criteria
Kamenov 2003	This is a conference abstract. The abstract does not provide details of the methodology or age of the participants and we were unable to contact the authors and request further details.
Kessel 2008	Allocation: Not clear Participants: The control group were healthy children
Lee 2003	Allocation: Randomised Participants: The study includes patients between 7 and 56 years
Ozcan 2002	This is a conference abstract. The abstract does not provide details of the methodology or age of the participants and we were unable to contact the authors to request further details.
Paunovic 2007	Allocation: Randomised Participants: Not clear Intervention: The trial compared combination therapy with placebo
Pinar 2008	Allocation: Not randomised
Ratner 1998	Allocation: Randomised Participants: The study includes patients between 13 and 80 years and did not provide separate data for children
Schenkel 1997	This is a conference abstract. The abstract does not provide details of the methodology or age of the participants and we were unable to contact the authors to request further details.
Snyman 2004	Allocation: Randomised Participants: The study included patients over 12 years (adults plus adolescents)
Stricker 1998	This is a conference abstract. The abstract does not provide details of the methodology or age of the participants and we were unable to contact the authors to request further details.