Psychosocial Situation of Children With Rare (Congenital) Pediatric Surgical Diseases and Their Families

Quality of life (QoL) of the parents, assessed from the perspective of the parents by the "Ulmer Lebensqualitätsinventar für Eltern chronisch kranker Kinder" (ULQIE; Goldbeck & Storck, 2002). The instrument consists of 29 items, which are answered on a five-point Likert scale (0 to 4). Higher scores indicate greater QoL.

Mental health of the parents, assessed from the perspective of the parents by the "Brief Symptom Inventory" (BSI; Franke, 2000). The instrument consists of 53 items, which are answered on a five-point Likert scale (0 to 4). Higher BSI scores indicate greater psychological distress.

Health-related quality of life of the chronically-ill children/adolescents, assessed from the perspective of the child/adolescent (from 10 years of age) and from the perspective of the parents by the "Pediatric Quality of Life Inventory 4.0" (Peds-QL 4.0; (Varni, Seid, & Kurtin, 2001). Items will be linearly transformed to a scale of 0 to 100, with higher scores indicating better HRQoL.

Psychiatric disorders of the chronically-ill children/adolescents and the siblings assessed perspective of the child/adolescent (from 10 years of age) and from the perspective of the parents by the "Strengths and Difficulties Questionnaire" (SDQ; Klasen, Woerner, Rothenberger, & Goodman, 2003). Items are rated on a three-point Likert scale (0 to 2). Higher scores represent greater psychopathology or greater prosocial behavior.

Coping of the parents, assessed from the perspective of the parents by the German version of the "Coping Health Inventory for Parents" (CHIP-D; McCubbin, McCubbin, Cauble & Goldbeck, 2001). Items are rated on a four-point Likert scale (0 to 3). Higher scores represent greater use of the respective coping pattern.

Coping of the chronically-ill children/adolescents and the siblings, assessed from the perspective of the children/adolescents (from 10 years of age) by the "Kidcope Checklist" (Kidcope; Spirito, Stark & Williams, 1988). Items related to frequency of the coping strategies are rated on a 4 point scale (0 = "Not at all" to 3 = "Almost all the time"), and items related to efficacy are rated on a 5 point scale (0 = "Not at all" to 4 = "Very much").

Social support of the parents, of the chronically-ill children/adolescents and of the siblings, assessed from the perspective of the parents, of the chronically-ill children/adolescents and from the sibling, respectively, by the "Oslo Social Support Scale" (OSSS; Dalgard, 2006). The sum score ranges from 3 to 14. The higher the sum score, the stronger the social support.

Sociodemographic information of the parents, assessed from the perspective of the parents by ad-hoc items.

Sibling relationship, assessed from the perspective of the siblings (from 10 years of age) by the "Sibling Relationship Questionnaire" (Bojanowski, Riestock, Nisslein, Weschenfelder-Stachwitz, & Lehmkuhl, 2015). Each item is scored on a 5-point Likert scale

(1 to 5).

Family relationships, family dynamics and functionality, assessed from the perspective of the parents, of the chronically-ill children/adolescents and from the sibling, respectively by "Familienbögen" (FB-A; Cierpka & Frevert, 1994). Items are rated on a four-point Likert scale (0 to 3)

Interpersonal problems assessed from the perspective of the parents by the "Inventory of Interpersonal Problems-32" (IIP-32; Thomas, Brähler, & Strauß, 2011). Items are rated on a four-point Likert scale from 0 (not at all) to 4 (extremely). It provides an overall score and eight subscale scores.

familial predispositions assessed from the perspective of the parents by the "Familien-Belastungs-Fragebogen" (FaBel; Ravens-Sieberer, 2001). Items are rated on a four-point Likert scale ranging from 1 (is not right at all) to 4 (is completely right).