 There is an increased incidence of psychiatric conditions within the distal 18p- population.In one study, 2 of 3 people with 18p- had an anxiety disorder, 1 of 3 had a communication disorder, and 1 of 3 had a motor skills disorders, and 1 of 3 had a stereotypic movement disorder.Additional research with a larger number of subjects is necessary to confirm these findings.