The roles of quality of life and family and peer support in feelings about transition to adult care in adolescents with gastroenterology, renal, and rheumatology diseases

•Better quality of life was associated with better feelings about healthcare transition.•Peer support was associated with better feelings about healthcare transition.•Family support was correlated with feelings about healthcare transition.•Interventions such as psychological treatment could improve quality of life.•Connecting with support groups or peer mentors may improve peer support.