prevalence of, 411
relationship to International Classification of 
Sleep Disorders, 413
risk and prognostic factors for, 412
Rett syndrome, 33, 38, 51, 53, 56, 57, 79, 80
RLS. See Restless legs syndrome
Rumination disorder, 329, 332–333
associated features supporting diagnosis of, 
332–333
comorbidity with, 333
development and course of, 333
diagnostic criteria for, 332diagnostic features of, 332
differential diagnosis of, 333
functional consequences of, 333
prevalence of, 333
risk and prognostic factors for, 333
Schizoaffective disorder, 89–90, 105–110
associated features supporting diagnosis of, 107
comorbidity with, 110
culture-related diagnostic issues in, 108–109
development and course of, 108
diagnostic criteria for, 105–106
diagnostic features of, 106–107
differential diagnosis of, 109–110
functional consequences of, 109
prevalence of, 107–108
risk and prognostic factors for, 108
suicide risk in, 109
Schizoid personality disorder, 645, 646, 652–655
associated features supporting diagnosis of, 
653–654
culture-related diagnostic issues in, 654
development and course of, 654
diagnostic criteria for, 652–653
diagnostic features of, 653
differential diagnosis of, 654–655
gender-related diagnostic issues in, 654
prevalence of, 654
risk and prognostic factors for, 654
Schizophrenia, 87, 99–105
associated features supporting diagnosis of,