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To study the potential usefulness of morning cortisol levels as a biomarker for vulnerability to depression, researchers examined depression and cortisol levels in two cohorts totaling 1858 teenagers in the U.K. between 1999 and 2009 (mean age, 14; 52% female).
Latent class analysis of baseline self-reported depressive symptoms and morning cortisol levels produced four baseline groups:
Class 1 (31%), low depression scores and low cortisol
Class 2 (27%), low depression scores and high cortisol
Class 3 (25%), high depression scores and low cortisol
Class 4 (17%), high depression scores and high cortisol
The model was sex-differentiated, with class 1 being 33% female and class 4 being 72% female.
At follow-up, which occurred 1 or 3 years later and in…