OBJECTIVES Being the victim of peer bullying is associated with increased risk of psychopathology, yet it is not known whether similar experiences of bullying increase risk of psychiatric disorder when the perpetrator is a sibling. We tested whether being bullied by a sibling is prospectively associated with depression, anxiety, and self-harm in early adulthood. METHODS We conducted a longitu...

OBJECTIVE Familial aggregation of Behçet's disease has been reported previously. The current study aimed at investigating the sibling recurrence risk ratio (lambda s) for Behçet's disease, which is of value in the estimation of the magnitude of genetic factors in the pathogenesis of Behçet's disease. METHODS 170 consecutive unrelated index cases (98 male, 72 female) were interviewed with a de...

Three boys with autism participated in a study of the effects of magnitude and quality of reinforcement on choice responding. Two concurrent response alternatives were arranged: (a) to play in an area where a peer or sibling was located, or (b) to play in an area where there was no peer or sibling. During one condition, the magnitude (i.e., duration of access to toys) or quality (level of prefe...

When females are sexually promiscuous, the intensity of sperm competition for males depends on how many partners females mate with. To maximize fitness, males should adjust their copulatory investment in relation to this intensity. However, fitness costs associated with sperm competition may not only depend on how many males a female has mated with, but also how related rival males are. Accordi...

This study examined how victimizations by either a sibling or peer are linked to each other and to mental health in childhood and adolescence. The data were from the National Survey of Children's Exposure to Violence which includes a sample of children aged 3-9 (N=1,536) and adolescents aged 10-17 (N=1,523) gathered through telephone interviews. An adult caregiver (usually a parent) provided th...

BACKGROUND There is a lack of theoretical framework supporting stem cell transplant nurses in their assessment, judgment and caring interventions of sibling stem cell donors. OBJECTIVE The purpose of this study was to explore sibling stem cell donors' main concerns and how they deal with them before and after donation. METHOD Ten healthy sibling donors, 5 men and 5 women, with a median age ...

OBJECTIVES We investigated the association between cesarean section (CS) and type 1 diabetes (T1D), and if the association remains after accounting for familial confounding by using a sibling-control design. METHODS We conducted a population-based cohort study of all singleton live births in Sweden between 1982 and 2009, followed by sibling-control analyses. T1D diagnoses were identified from...

Sibling competition has been shown to affect overall growth rates in birds. However, growth consists on the coordinated development of a multitude of structures, and there is ample scope for developmental plasticity and trade-offs among these structures. We would expect that the growth of structures that are used in sibling competition, such as the gape of altricial nestlings, should be priorit...

BACKGROUND Understanding how the cognitive, emotional and behavioural components of sibling attitudes interact with one another at various stages of a sibling's lifespan will allow clinicians to provide better support to children with autism spectrum disorder (ASD) and their families. However, no research exists which focusses on describing the attitudes of adolescent siblings of children with ...

PURPOSE Studies of later-life families have revealed that sibling tension often increases in response to parents' need for care. Both theory and research on within-family differences suggest that when parents' health declines, sibling relations may be affected by which children assume care and whether siblings perceive that the parent favors some offspring over others. In the present study, we ...