ABSTRACT
The early recognition of ASD in adults is challenging, in particular due to the lack of appropriate and robust diagnostic tools. We performed a psychometric validation and diagnostic accuracy study of the French version of the RAADS-R on a sample of 305 adults: 105 with ASD without ID, 99 with psychiatric disorders, and 103 non-psychiatric control groups. The French version of the RAADS-R demonstrates good reliability and diagnostic validity, suggesting that it can help clinicians during the diagnostic process in adults with ASD without ID. However, the finding that a two-factor structure better fits the results requires further validation. This study point out the need of further study of RAADS in psychiatric disorders group due to the relatively high false positive rate (55.6%) of ASD.
Subject(s)
Asperger Syndrome/diagnosis , Asperger Syndrome/psychology , Autistic Disorder/diagnosis , Autistic Disorder/psychology , Psychometrics/standards , Translating , Adolescent , Adult , Aged , Asperger Syndrome/epidemiology , Autistic Disorder/epidemiology , Cross-Sectional Studies , Female , France/epidemiology , Humans , Male , Middle Aged , Psychometrics/methods , Reproducibility of Results , Young AdultABSTRACT
Light-adapted (LA) electroretinograms (ERGs) from 90 individuals with autism spectrum disorder (ASD), mean age (13.0 ± 4.2), were compared to 87 control subjects, mean age (13.8 ± 4.8). LA-ERGs were produced by a random series of nine different Troland based, full-field flash strengths and the ISCEV standard flash at 2/s on a 30 cd m-2 white background. A random effects mixed model analysis showed the ASD group had smaller b- and a-wave amplitudes at high flash strengths (p < .001) and slower b-wave peak times (p < .001). Photopic hill models showed the peaks of the component Gaussian (p = .035) and logistic functions (p = .014) differed significantly between groups. Retinal neurophysiology assessed by LA-ERG provides insight into neural development in ASD.
Subject(s)
Autism Spectrum Disorder/physiopathology , Electroretinography/methods , Retina/physiology , Adolescent , Case-Control Studies , Female , Humans , Models, Biological , Photic StimulationABSTRACT
The Ritvo Autism Asperger Diagnostic Scale-Revised (RAADS-R) is a valid and reliable instrument to assist the diagnosis of adults with Autism Spectrum Disorders (ASD). The 80-question scale was administered to 779 subjects (201 ASD and 578 comparisons). All ASD subjects met inclusion criteria: DSM-IV-TR, ADI/ADOS diagnoses and standardized IQ testing. Mean scores for each of the questions and total mean ASD vs. the comparison groups' scores were significantly different (p < .0001). Concurrent validity with Constantino Social Responsiveness Scale-Adult = 95.59%. Sensitivity = 97%, specificity = 100%, test-retest reliability r = .987. Cronbach alpha coefficients for the subscales and 4 derived factors were good. We conclude that the RAADS-R is a useful adjunct diagnostic tool for adults with ASD.
Subject(s)
Asperger Syndrome/diagnosis , Autistic Disorder/diagnosis , Adult , Female , Humans , Male , Psychiatric Status Rating Scales , Psychometrics , Sensitivity and Specificity , Social Behavior , Surveys and QuestionnairesABSTRACT
Previous studies found substantial variability in adult outcome for people with autism whose cognitive functioning was within the near-average and average ranges. This study examined adult outcome for 41 such individuals (38 men and 3 women) originally identified through an epidemiological survey of autism in Utah. Mean age at the time of their previous cognitive assessment was 7.2 years (SD=4.1, range=3.1-25.9 years) and at follow-up was 32.5 years (SD=5.7 years, range=22.3-46.4 years). Outcome measures included standardized assessments of diagnostic status, cognitive ability, and adaptive behavior. Additional information collected concerned demographic variables, indicators of independence, social relationships, medical and psychiatric conditions, and social service use. Outcomes for this sample were better than outcomes described in previous work on individuals with similar cognitive functioning. For example, half of the participants were rated as "Very Good" or "Good" on a global outcome measure. As in previous studies, there was considerable variability in measured cognitive ability over time. Over half of the sample had large gains or losses of cognitive ability of greater than 1 standard deviation. Cognitive gain was associated with better outcome, as was better adaptive functioning. While all participants had baseline IQs in the nonimpaired range, there was limited evidence to support the use of other early childhood variables to predict adult outcome.
Subject(s)
Autistic Disorder/epidemiology , Cognition Disorders/epidemiology , Cognition , Activities of Daily Living , Adaptation, Psychological , Adolescent , Adult , Autistic Disorder/psychology , Child , Child, Preschool , Cognition Disorders/psychology , Comorbidity , Female , Follow-Up Studies , Health Status , Humans , Longitudinal Studies , Male , Mental Disorders/epidemiology , Mental Disorders/psychology , Middle Aged , Social Behavior , Social Work, Psychiatric/statistics & numerical data , Utah/epidemiology , Young AdultABSTRACT
An empirically based 78 question self-rating scale based on DSM-IV-TR and ICD-10 criteria was developed to assist clinicians' diagnosis of adults with autism and Asperger's Disorder-the Ritvo Autism and Asperger's Diagnostic Scale (RAADS). It was standardized on 17 autistic and 20 Asperger's Disorder and 57 comparison subjects. Both autistic and Asperger's groups scored significantly higher than comparison groups with no overlap; sensitivity, specificity, and content validity equaled one. Cronbach's alpha coefficients of internal consistency of three subscales were satisfactory. Gender, age, and diagnostic categories were not significantly associated factors. The RAADS can be administered and scored in less than an hour and may be useful as a clinical scale to assist identification of autism and Asperger's Disorder in adults. The RAADS does not distinguish between autism and Asperger's Disorder.
Subject(s)
Asperger Syndrome/diagnosis , Autistic Disorder/diagnosis , Diagnostic and Statistical Manual of Mental Disorders , International Classification of Diseases , Personality Inventory/statistics & numerical data , Adult , Asperger Syndrome/psychology , Autistic Disorder/psychology , Diagnosis, Differential , Female , Humans , Male , Mental Disorders/diagnosis , Mental Disorders/psychology , Psychometrics , Reference Values , Reproducibility of Results , Surveys and QuestionnairesABSTRACT
OBJECTIVE: The aim of this study is to obtain clinical evidence to test the hypothesis that Asperger's disorder (AD) is a mild form of autism (AU). METHOD: A 78-item Likert scale (the RAADS) was administered to 25 adults with AD and 19 with AU (ages, 18-65 years) to assess presence, type, and duration of symptoms. RESULTS: The following results were found: (a) subjects with AD and AU have similar symptoms throughout adulthood (responses to 72 of 78 questions were not significantly different); (b) subjects with AD had a significantly fewer total number of symptoms; (c) subjects with AD reported nonsignificantly fewer symptoms in the DSM-IV-TR domains of social interaction and repetitive patterns of behavior; and (d) subjects with AD had significantly fewer symptoms in the communication domain. CONCLUSIONS: The data support the hypothesis that AD is a mild form of AU, and that they share a common etiology and developmental neuropathology. It appears warranted in future diagnostic manuals to incorporate AU and AD into 1 diagnostic category such as, "Autism Spectrum Disorder, (with modifiers, severe, moderate, mild, atypical, and Asperger's type)."
Subject(s)
Asperger Syndrome/psychology , Autistic Disorder/psychology , Adult , Behavior , Communication , Female , Humans , Interpersonal Relations , Male , Psychiatric Status Rating ScalesABSTRACT
Concentrations of melatonin in overnight and first-voiding urine samples from 10 people with autism, 15 parents, 1 grandparent, 9 sibs without autism, and 10 healthy, unrelated volunteers, were measured by radioimmunoassay. Those with autism had significantly higher melatonin concentrations in the first voiding samples than controls. Groups did not differ in overnight melatonin concentrations. These preliminary results warrant replication and extension.
ABSTRACT
Two hundred and forty-one children with autism were ascertained and diagnosed (DSM-III criteria) in an epidemiologic survey of Utah. Pediatric and other pertinent medical records were abstracted for 233 patients and 66 of their siblings without autism for otitis media, upper respiratory, and other infections. A significantly greater number of children with autism had recurrent otitis media, upper respiratory and other infections than their nonautistic siblings. A greater number of children with autisru with recurrent infections had lower IQ scores, seizures, hearing deficits, delayed motor milestones, poorer speech, congenital anomalies, feeding problems, vomiting, diarrhea, and other types of infections than children with autism with mild or no infections. The only significant pre-, peri-, or postnatal risk factors between children with autism with recurrent, mild or no infection was an increase in the maternal-fetal incompatibility (ABO or Rh) in the recurrent infection group. Half the families with more than one child with autism had recurrent infections and 72% of those children with concurrent diseases which effect the CNS had recurrent infections. Methodological limitations are discussed.
