Biomedical subjects

Pieter F A de Nijs

Publications and source records attributed to Pieter F A de Nijs.

5 recordsLinked to original sources

PubMed2007

High rates of psychiatric co-morbidity in PDD-NOS.

Rates of co-morbid psychiatric conditions in children with Pervasive Developmental Disorder-Not Otherwise Specified (PDD-NOS) are hardly available, although these conditions are often considered as more responsive to treatment than the core symptoms of PDD-NOS. Ninety-four children with PDD-NOS, aged 6-12 years were included. The DISC-IV-P was administered. At least one co-morbid psychiatric disorder was present in 80.9% of the children; 61.7% had a co-morbid disruptive behavior disorder, and 55.3% fulfilled criteria of an anxiety disorder. Compared to those without co-morbid psychiatric disorders, children with a co-morbid disorder had more deficits in social communication. Co-morbid disorders occur very frequently in children with PDD-NOS, and therefore clinical assessment in those children should include assessment of co-morbid DSM-IV disorders.

Adolescent↗

PubMed2007

Multiple complex developmental disorder delineated from PDD-NOS.

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 thought problems and social contact problems using the child behavior checklist/4-18, the Dutch version of the diagnostic interview schedule for children-Version IV, the child and adolescent functional assessment scale, and the autism diagnostic observation schedule-generic. MCDD was associated with anxiety disorders, disruptive behavior, and psychotic thought problems. PDD-NOS was associated with deficits in social contact. MCDD differs from autistic disorder, and can also be delineated from PDD-NOS.

Anxiety Disorders↗

PubMed2006

No hyperactive-impulsive subtype in teacher-rated attention-deficit/hyperactivity problems.

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 addition, co-morbidity levels in the different ADH Problems groups were compared. LCA yielded three different groups of children and adolescents with both Inattention and hyperactivity-impulsivity, and one group with high scores on Inattention but low scores on hyperactivity-impulsivity. A group of patients with predominantly hyperactivity and impulsivity was not found. Individuals in groups with higher levels of ADH Problems had significantly higher levels of oppositional defiant (OD) and conduct problems, and, although to a lesser extent, significantly higher levels of affective and anxiety problems than individuals in groups with lower levels of ADH Problems. It may not be useful to discern the hyperactive-impulsive type of ADHD.

Adolescent↗

PubMed2005

Latent class analysis of anxiety and depressive symptoms in referred adolescents.

BACKGROUND: Comorbidity between anxiety disorders and depressive disorders in adolescents occurs very frequently. The aim of this study was to investigate if anxiety and depression represent distinct disease entities. METHODS: Two thousand thirty two 11- to 18-year-olds, referred to mental health services, were investigated. Self-reported symptoms of anxiety and depression were analyzed with latent class analysis. RESULTS: The numbers of adolescents with severe depression symptoms, but with less severe, or absent, anxiety symptoms, were negligible. Further, two subgroups could be discerned in those with severe anxiety symptoms: one with severe depressive symptoms, and one with mild depressive symptoms. LIMITATIONS: A self-report questionnaire was used, whereas diagnostic interview information regarding DSM-IV disorders was not available. DISCUSSION: It seems less useful to develop treatments, or to conduct studies aimed at etiological mechanisms, that are specifically aimed at depression and not at anxiety. Further, it may be relevant to discern specific subgroups of anxious adolescents, with severe versus mild comorbid depression symptoms.

Adolescent↗

PubMed2004

Attention-deficit/hyperactivity disorder (ADHD): parents' judgment about school, teachers' judgment about home.

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 teachers as informants. Both parents and teachers reported about the child's ADHD symptomatology at home as well as at school. RESULTS: Parents and teachers showed high within-observer cross-situational presence of ADHD symptoms. However, the between-observer agreement on the presence of ADHD symptoms within the same situation (home or school) was low. This pattern held equally true for attention/concentration and hyperactivity/impulsivity symptom scores. CONCLUSIONS: In evaluating ADHD symptomatology, it is important to obtain independent reports about the child's behaviour at school from the teacher and about the child's behaviour at home from the parents.

Adolescent↗