3. Subgroup membership of included studies.

Study ID	Socioeconomic Level	Age	Stage of Disease
Belsky 1994		7 ‐ 18 years
Chernoff 2002	Mothers' educational level	7 ‐ 11 years	chronic?
Christian 2006		8 – 12 years	chronic
Delk 1994		10 ‐ 41 years
Goodill 2005		> 17 years
Grasso 2000		< 2 years	post diagnosis
Hernandez‐Reif 1999	Hollingshead	5 ‐ 15 years	chronic?
Powers 2003	Hollingshead	< 3 years	post diagnosis
Powers 2005		18 ‐ 48 months	post diagnosis
Quittner 2000		9.5 to 16.5 years
Quinn 2004	Employment status
Stark 1996	Holligshead, Control group ‐ II, Intervention group III	3 ‐10 years control, 5 ‐ 10 years intervention	chronic?
Stark 2003	Hollingshead & family income	4 ‐ 12 years
Stark 2009	Mother’s and father’s education, income before taxes	4 – 12 years
Taylor 2003		> 15 years
Vandemheen 2009	highest level of education	> 18 years	considering transplantation
Wilkinson 2008		21 ‐ 41 years	on transplantation list

Not all characteristics were reported for every study. That is the reason why some parts are left empty.