Table 1.

Characteristics of the nine articles included by the researchers.

Reference Article [Reference No.]	Title	Publication Year	Country	Study Design
Ferreira Marciano, A.R. [30]	Quality of life in siblings of autistic patients	2004	Brazil	Case-control
Orsmond, G.I. [22]	Siblings of individuals with an autism spectrum disorder: Sibling relationships and well-being in adolescence and adulthood	2009	United States of America	Cross-sectional
Vieira, C.B.M. [31]	Quality of life of siblings of children included in the autism spectrum	2012	Brazil	Cross-sectional
Hastings, R.P. [32]	Self-reported behavior problems and sibling relationship quality by siblings of children with autism spectrum disorder	2013	United Kingdom	Case-control
Chan, J.Y.N. [33]	Psychological adjustment of siblings of children with autism spectrum disorder in Hong Kong	2016	China	Case-control
Tomeny, T.S. [34]	Sibling relationship quality and psychosocial outcomes among adult siblings of individuals with autism spectrum disorder and individuals with intellectual disability without autism	2017	United States of America	Case-control
Esfahani, F.N. [35]	Internalizing and externalizing problems, empathy quotient, and systemizing quotient in 4- to 11-year-old siblings of children with autistic spectrum disorder compared to control group	2018	Iran	Case-control
Koukouriki, E. [20]	Self-reported health-related quality of life (HRQOL) and anxiety among Greek school-age siblings of Iindividuals with autism spectrum disorders (ASD) in relation to parental mental health and social support	2020	Greece	Case-control
Garrido, D. [9]	Siblings of children with autism spectrum disorders: social support and family quality of life	2020	Spain	Case-control