Unexplained symptoms and depression/anxiety
The Dutch data came from 10 GPs whose practices have been collecting information since 1985. Between 1997 and 2008 there were 419,056 consultations with about 16,000 adult patients.
Common unexplained complaints were tiredness, back pain and sleep problems. The prevalence of anxiety was 5.8/1000 patients/year and the prevalence of depression was 22.2/1000 patients/year.
Patients with nausea, muscle pain or general abdominal pain had three times the chance of having anxiety disorder. Those with sleep disturbance had three times the chance of a having a depressive disorder.