Study	Reason for exclusion
Bergman 2008	Prospective cohort study
Boone 2002	Intervention is purely educational with no feedback from a healthcare professional
Burkhart 1996	Trial of educational technique not telehealthcare as defined
Burkhart 2007	No feedback given to the patients who improve their self‐monitoring
Chan 2003	Only 10 patients, non‐randomised pilot study
Chandler 1990	RCT but only 3 asthma patients ‐ therefore sample size is too small, pilot trial
Delaronde 2005	Not randomised ‐ patient choice of intervention
Finkelstein 1998	Not RCT, pilot study only
Finkelstein 2000	Not RCT, discussion piece
Finkelstein 2001	Not RCT
Finkelstein 2007	Not RCT
Huss 1992	Education only, not telehealthcare
Huss 2003	Education only, not telehealthcare
Jaana 2009	Systematic review
Joseph 2007	Programme delivered to African‐American high school students at school with supervision, not telehealthcare
Joshi 2009	Prospective, non‐randomised pre‐post study
Karp 2000	Not limited to asthma; asthma data can not be separated.
Le 2007	Education only; not telehealthcare
Lin 2009	Convenience sampling method
Maiolo 2003	Before and after study design
Malone 2004	Same study as Chan 2007
Marcin 2004	Convenience sampling of children
McCLure 2008	Focus is on data collection methods not telehealthcare
Patel 2009	No medical advice given over telephone ‐ therefore not telehealthcare
Pinnock 2007b	Qualitative study
Porter 2006	Not telehealthcare; takes place in emergency health department
Reddel 1998	Study aims to assess only the quality of the spirometry
Smith 2009	Discussion article
Sockrider 2006	RCT of telehealthcare but protocol was to report after 12 months and only interim results from 9 months have been published
van den Berg 2002	The phone line was for GPs to contact hospital for information regarding asthma guidelines
Wise 2007	No results; describes the system for obtaining them
Young 2003	Not asthma; range of other conditions
Zamith 2009	Not randomised

RCT = randomised controlled trial