From New York Magazine’s article, “The Collateral Damage of a Teenager”:

In 1994, Steinberg publishedCrossing Paths, one of the few extensive accounts of how parents weather the transition of their firstborns into puberty, based on a longitudinal study he conducted of more than 200 families. Forty percent of his sample suffered a decline in mental health once their first child entered adolescence. Respondents reported feelings of rejection and low self-worth; a decline in their sex lives; increases in physical symptoms of distress. It may be tempting to dismiss these findings as by-products of midlife rather than the presence of teenagers in the house. But Steinberg’s results don’t seem to suggest it. “We were much better able to predict what an adult was going through psychologically,” he writes, “by looking at his or her child’s development than by knowing the adult’s age.”