Featured News and Research Highlights
January 9, 2026
Loneliness During Adolescence and Subsequent Health and Well-Being in Adulthood: An Outcome-Wide Longitudinal Approach
Using nationally representative data from Waves I, II, IV, and V of the National Longitudinal Study of Adolescent to Adult Health (Add Health), Dr. Kim et. al. examined the impact of loneliness during adolescence on health and well-being later in adulthood. Loneliness was measured with a survey question asking how...
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December 19, 2025
Wave V Epigenetic Clocks Data Now Available
Add Health is excited to announce the following data are now available: Wave V Epigenetic Clocks: Biological aging measures were derived from DNA methylation data for 4,626 unique study participants based on blood collected during the Wave V home exam. The measures include Horvath, PhenoAge, GrimAge, DunedinPACE, Principal Component clocks,...
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December 16, 2025
Pollution Exposure and Allergies and Asthma: Evidence from the Add Health Study
A recent study using nationally representative data from Waves IV and V of the National Longitudinal Study of Adolescent to Adult Health (Add Health) examines the effects of long-term exposure to two widely cited pollutants, ozone (O₃) and particulate matter 2.5 (PM₂.₅), on allergy and asthma diagnoses in adolescents and...
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November 24, 2025
Adolescents’ Survival Expectations and Premature Mortality: Evidence From the Add Health Study
There is a large pool of research focusing on how adolescents’ perceptions of survival predict important aspects of their young adult lives, especially their physical and mental health, risky behaviors, and socioeconomic status. Using nationally representative data from Wave I of the National Longitudinal Study of Adolescent to Adult Health...
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