Behavioral phenotype in adults with Prader-Willi syndrome

▶ No diminishment of behavioral problems in older adults with PWS. ▶ More behavioral problems in PWS adults with mUPD compared with deletion. ▶ More behavioral problems in PWS adults with Type I deletion compared with Type II deletion. ▶ More self-absorbed behavior in PWS adults with a BMI < 25 compared with BMI 25-30.