[Prospective studies on dynamics of depression from preadolescence to early adolescence].

Aim: The aim of the study is to evaluate the changes in prevalence and dynamics of depression during puberty. It was conducted in prospective studies in a representative group of large-town primary school students.
Method: A group of 1993, 10 year-old students were chosen in a two-stage draw. They were studied with the Karków Depression Inwentory (KID) in the subsequent years 2001, 2002, 2003.
Results: The point prevalence of depression was respectively 29%, 30% and 26% for 10, 11 and 12 year-olds. The spread-out rate of depressive disorder was relatively stable.
Conclusions: Depression is more common in pre-adolescent boys than girls. The dynamics of the disorder, when studied in these three years show that depression is a disorder with a very unequivocal course amongst the preadolescents.