Depression..why it is happening?

Children who were less socially competent in childhood were more likely to have symptoms of anxious or depressed mood in adolescence. Similarly, young people who were less socially competent in adolescence were at greater risk for symptoms of anxiety and depression in young adulthood. The findings remained the same when the researchers took into account some other possible explanations, such as intellectual functioning, the quality of parenting, social class, and such problems as fighting, lying, and stealing. And the results were generally the same for both males and females