Pieter F A de Nijs

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This study aimed to contribute to the Diagnostic and Statistical Manual (DSM) debates on the conceptualization of autism by investigating (1) whether empirically based distinct phenotypic profiles could be distinguished within a sample of mainly cognitively able children with pervasive developmental disorder (PDD), and (2) how profiles related to diagnoses(More)
The aim of this study was to investigate which homogeneous groups, according to teacher reports of attention-deficit/hyperactivity (ADH) Problems on the Teacher's Report Form (TRF), can be identified in a referred sample (n = 4,422; age = 6-18 years; mean age = 9.9 years; 66% boys, 34% girls). Latent class analysis (LCA) was conducted on ADH Problems. In(More)
Autistic features such as deficits in social interactions and communication have been associated with a low 2D:4D ratio in normal children.This study assessed this association in a large sample of children with a variety of psychiatric disorders (n = 35 girls and n = 147 boys). Autistic features were assessed with a highly valid and reliable measure (Autism(More)
The objective of this study was to identify behavioral differences between children with multiple complex developmental disorder (MCDD) and those with pervasive developmental disorder-not otherwise specified (PDD-NOS). Twenty-five children (6-12 years) with MCDD and 86 children with PDD-NOS were compared with respect to psychiatric co-morbidity, psychotic(More)
OBJECTIVE The aim of this study was to separate sources of observer and situational variance in reporting attention-deficit/hyperactivity disorder (ADHD) symptomatology. METHOD In a sample of 30 children diagnosed with ADHD, ADHD symptomatology was assessed with the Diagnostic Interview Schedule for Children-Parent Version (DISC-P), with parents and(More)
BACKGROUND Previous studies have found considerable overlap between attention/hyperactivity problems, aggressive/oppositional problems and delinquent/conduct problems in adolescents. SAMPLING AND METHODS Mothers of 1,965 11- to 18-year-olds (1,116 boys, 849 girls), referred to mental health agencies, completed the Child Behavior Checklist (CBCL). Latent(More)
Dermatoglyphics are the ridge constellations found on the hand palms and foot soles that are permanently formed by the 24th week of pregnancy. Associations have been found between adult schizophrenia and irregularities and asymmetries in dermatoglyphics. Children have not been studied before. The aim of this study was to assess the association between(More)
BACKGROUND Trichotillomania (TTM) is a psychiatric condition that first manifests itself in infancy and adolescence. If untreated, the condition can become chronic. TTM places a considerable burden on the individual patient. The condition is often linked to social isolation and the emergence of somatic and psychiatric comorbidity. Nevertheless, investment(More)
Limited quality of social relations, milder symptom severity and higher intelligence were shown to account for higher anxiety levels in autism spectrum disorders. The current study replicated and extended earlier findings by combining these three determinants of anxiety in autism spectrum disorders in one study. The sample consisted of 134 school-aged(More)
BACKGROUND There is growing interest in autism spectrum disorders (asd) in adulthood. Someone can be diagnosed with ASD, but the diagnosis tells us very little about the patient’s temperament, character and personality. Comparatively little is known about the personality traits of persons with ASD. AIM To map personality traits of persons with asd.(More)
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