adj.shaped in the form of the letter U

Is well-being U-shaped over the life cycle?
Inverted-U-shaped dopamine actions on human working memory and cognitive control.
Is job satisfaction U‐shaped in age?
U‐shaped relationship between mortality and admission blood pressure in patients with acute stroke
Alcohol and mortality in British men: explaining the U-shaped curve
www.elsevier.com/locate/socscimed Is well-being U-shaped over the life cycle?
2008), 'Is well-being U-shaped over the life cycle
Hypothesis concerning the U-shaped relation between body mass index and mortality
of Labor Is Well-Being U-Shaped over the Life Cycle?
Optimal Income Taxation: An Example with a U-Shaped Pattern of Optimal Marginal Tax Rates