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Sexual minority adolescents are more likely to have mental health problems, adverse social environments, and negative health outcomes compared with their heterosexual counterparts. There is a paucity of up-to-date population-level estimates of the extent of risk across these domains in the UK. We analysed outcomes across mental health, social environment, and health-related domains in sexual minority adolescents compared with their heterosexual counterparts in a large, contemporary national cohort.

The Millennium Cohort Study (MCS) is a birth cohort study in the UK following up children born between Sept 1, 2000, and Jan 11, 2002 across England, Wales, Scotland, and Northern Ireland. Children recruited from the MCS have been followed up over six recruitment sweeps to date at ages 9 months, 3 years, 5 years, 7 years, 11 years, and 14 years. We analysed mental health, social …