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Supporting information S1 Siblings of individuals with Smith-Magenis syndrome (SMS) behavioural assessment survey. Siblings and parents of siblings of individuals with SMS responded to a questionnaire to assess the levels of positive and negative behavioural traits of siblings. The survey includes general demographics of the siblings and the individuals with SMS. E. Schaeffer and M. Edgerton's unpublished 1979 ‘Sibling behaviour to handicapped child inventory’ survey was utilized to assess the levels of positive and negative behavioural traits of siblings of individuals with SMS; see questions 1–28 under ‘Sibling Inventory of Behavior’.

Table S1 Multiple regression analysis of the predictors that influence positive and negative behavioural traits as reported by siblings of individuals with Smith–Magenis syndrome.

Table S2 Multiple regression analysis of the predictors that are associated with parents' perception of the positive and negative behavioural traits of siblings of individuals with Smith–Magenis syndrome.

FilenameFormatSizeDescription
jir1581_sm_Data.pdf130KSupporting info item
jir1581_sm_tableS1-2.doc86KSupporting info item

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