[Study on the prevalence of mental diseases in Shaoxing city between 1991 and 2001].

Objective: This study aimed to compare the prevalence of mental disorders and services for people with mental health problems in Shaoxing city between 1991 and 2001 in order to provide scientific bases for prevention and treatment.

Methods: A population size of 339 651 were investigated in the urban and rural areas with "Psychosis Index Investigate Schedule" plus visit to their homes.

Results: The overall prevalence rates of mental disorders were 10.