National Sleep Foundation

Chapter 7: Sleep-Related Movement Disorders

Prevalence of Periodic Limb Movement Disorder (PLMD)

Periodic Limb Movement Disorder (PLMD) prevalence is not known. The prevalence of PLMD in children and adolescence is elevated in children with attention-deficit hyperactivity disorder (ADHD)and some psychiatric disorders. (For information on the difference between PLMD and periodic limb movements during sleep, see Periodic Limb Movement Disorder (PLMD).

References 

2 Picchietti DL, Walters AS. Moderate to severe periodic limb movement disorder in childhood and adolescence. Sleep. 1999;22:297-300.