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Background: High friendship quality is often defined by high levels of intimacy, companionship, closeness and low levels of conflict. Quality friendships develop over time and may be influenced by both behaviour problems and social skills. Materials and methods: Participants were 103, 13-year-old adolescents with or without intellectual disabilities in the United States. Adolescents and their mothers participated in an open-ended interview of friendship quality and completed measures of social skills and behaviour problems. This study addressed differences in friendship quality between children with and without intellectual disabilities and explored early indicators of friendship development. Results: Adolescents with intellectual disabilities (ID) had friendships characterized by significantly lower levels of warmth/closeness and positive reciprocity than their typically developing peers. Likewise, adolescents with ID spent less time with friends outside of school and were less likely to have a cohesive group of friends. Social skills and behaviour problems at age 9 predicted friendship quality at age 13 above and beyond disability status, with higher levels of social skills and lower levels of behaviour problems related to higher ratings on measures of friendship quality. Conclusions: It appears that adolescents with intellectual disabilities have friendships that are characterized by less warmth/closeness and less positive reciprocity than the friendships of their typically developing peers. This discrepancy appears to be impacted by early social skills and behaviour problems in addition to the presence of the intellectual disability.

Background: Few studies have investigated parental separation, partnering and re-partnering among population-based cohorts of children at risk of intellectual or developmental disabilities. Methods: Secondary analysis of data extracted from Waves 1-3 of the UK's Millennium Cohort Study. Information on the residence status of parents at Waves 1, 2 and 3 was available for 10 848 families. Results: Children with early cognitive delay (ECD) were significantly less likely than other children to be living in households with both biological parents or in households where the mother was married at all time points, including at the time of the child's birth and when children were aged 9 months, 3 years and 5 years. Although families with a child with ECD were more likely than families with a typically developing child to experience changes in both family composition and marital status over the first 5 years of the child's life, the net effect of these changes in family composition and marital status from the time of the child's birth to the time the child was 5 years old was similar for both groups of families. The increased levels of family change amongst families with a child with ECD were wholly accounted for by differences in family socio-economic circumstances. Conclusions: More attention needs to be paid to describing and explaining the dynamics of family composition in the early years of children with intellectual and developmental disabilities. "Stress reaction" models attempting to account for rates of parental separation need to incorporate socio-economic factors.