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The objective of this study was to identify subgroups of toddlers with DSM-5 ASD based on core ASD symptoms using a person-based analytical framework. This is a retrospective study of 500 toddlers (mean age 26 months, 79% male) with DSM-5 ASD. Data were analyzed using latent class analyses in which profiles were formed based on ASD symptomatology. Social communication (SC) symptoms favored a three-class solution, while restricted/repetitive behaviors (RRBs) favored a two-class solution. Classes with higher consistency of SC deficits were younger, with lower developmental functioning. The class with more RRBs was older, with higher functioning. If confirmed in other populations, these classes may more precisely characterize subgroups within the heterogeneous group of toddlers at time of ASD diagnosis. [ABSTRACT FROM AUTHOR]

BACKGROUND AND OBJECTIVES: Genetic testing is recommended for individuals with autism spectrum disorder (ASD). Pathogenic yield varies by clinician and/or patient characteristics. Our objectives were to determine the pathogenic yield of genetic testing, the variability in rate of pathogenic results based on subject characteristics, and the percentage of pathogenic findings resulting in further medical recommendations in toddlers with a Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition diagnosis of ASD. METHODS: We conducted a retrospective chart review of 500 toddlers, 18 to 36 months, diagnosed with Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition ASD (mean age: 25.8 months, 79% male). Subject demographics, medical and neuropsychological characteristics, and genetic test results were abstracted. Genetic results were divided into negative or normal, variants of unknown significance, and pathogenic. Subject characteristics were compared across results. Manual chart review determined if further recommendations were made after pathogenic results. RESULTS: Over half of subjects (59.8%, n = 299) completed genetic testing, and of those, 36 (12.0%) had pathogenic findings. There were no significant differences in Bayley Scales of Infant Development cognitive (P = .112), language (P = .898), or motor scores (P = .488) among children with negative or normal findings versus a variant of unknown significance versus pathogenic findings. Medical recommendations in response to the genetic finding were made for 72.2% of those with pathogenic results. CONCLUSIONS: Our findings reinforce the importance of genetic testing for toddlers diagnosed with ASD given the 12% yield and lack of phenotypic differences between subjects with and without pathogenic findings. The majority of pathogenic results lead to further medical recommendations. [ABSTRACT FROM AUTHOR]

Learning problems (LP) can have wider implications than the academic deficits per se. The goal of the present series of studies was to develop a reliable and valid quality-of-life measure targeted to children and adolescents with LP. In Study 1, using a 35-item questionnaire, we surveyed 151 parents/guardians of children referred for assessment of learning disorders. Exploratory factor analysis identified a three-factor model: Academic Performance, School Understanding, and Child/Family Psychological. These factors were validated against standardized measures of academic achievement and psychosocial functioning. The questionnaire was then reduced to 15 items—the LD/QOL15 —and administered to a community sample of 325 parents/guardians of children in Grades 1 to 8 (Study 2). The three-factor model was verified with confirmatory factor analysis. Comparison of general education (n = 232) and LP (n = 93) groups within the community sample documented substantial group differences (p < .0001), with the LP group having higher mean scores. These differences were larger for older students (Grades 5–8) than younger students (Grades 1–4; p < .01). The LD/QOL15 is a brief and reliable measure that is valid to assess quality of life and, potentially, outcomes in children and adolescents with LP. [ABSTRACT FROM AUTHOR]

The purpose of the present study was to explain the moderating role of rapid automatized naming (RAN) in word reading with a cusp catastrophe model. We hypothesized that increases in RAN performance speed beyond a critical point would be associated with the disruption in word reading, consistent with a "generic shutdown" hypothesis. Participants were 587 elementary schoolchildren (Grades 2–4), among whom 87 had reading comprehension difficulties per the IQ-achievement discrepancy criterion. Data were analyzed via a cusp catastrophe model derived from the nonlinear dynamics systems theory. Results indicated that for children with reading comprehension difficulties, as naming speed falls below a critical level, the association between core reading processes (word recognition and decoding) becomes chaotic and unpredictable. However, after the significant common variance attributed to motivation, emotional, and internalizing symptoms measures from RAN scores was partialed out, its role as a bifurcation variable was no longer evident. Taken together, these findings suggest that RAN represents a salient cognitive measure that may be associated with psychoemotional processes that are, at least in part, responsible for unpredictable and chaotic word reading behavior among children with reading comprehension deficits. [ABSTRACT FROM AUTHOR]

The purpose of the present study was to examine the hypothesis that a nonlinear relationship exists between a performance-classroom climate and the reading achievement of adolescent students with learning disabilities (LD). Participants were 62 students with LD (Grades 5–9) from public elementary schools in northern Greece. Classroom climate was assessed using the Patterns of Adaptive Learning Styles. Achievement in reading was assessed using a normative reading assessment. Data were analyzed by means of catastrophe theory in which the behavior is predicted as a function of two control variables, the asymmetry factor and the bifurcation factor. Reading achievement (word identification) was predicted by students’ ability to decode pseudowords (asymmetry variable) and by a mastery or performance motivational discourse (bifurcation factor). Results indicated that in classrooms with a performance goal structure, the cusp model fit the data and accounted for 54% of the variance in real word identification. In this condition, the association between pseudoword reading and real word reading was nonlinear. When a mastery climate was tested as a bifurcation variable, results indicated that its effect was nonsignificant and that instead the linear model fitted the data more adequately. Thus, increases in a classroom’s performance motivational discourse are associated with sudden, unpredictable, and discontinued changes in students’ reading performance. [ABSTRACT FROM AUTHOR]

The purpose of the present studies was to test the hypothesis that the psychometric characteristics of ability scales may be significantly distorted if one accounts for emotional factors during test taking. Specifically, the present studies evaluate the effects of anxiety and motivation on the item difficulties of the Rasch model. In Study 1, the validity of a reading comprehension scale was evaluated using the Rasch model with 60 students with learning disabilities (LD). Item parameters were retested for the presence of anxiety and results indicated that the scale was substantially more difficult in its presence. Study 2 replicated the findings of Study 1 using maladaptive motivation and extended with inclusion of adaptive motivational variables in order to reverse the effect. Results using students with and without LD indicated that the difficulty levels of the scale was lower for students with LD, in the presence of positive motivation, compared with a typical student group. Study 3 extended the dichotomous hierarchical generalized linear model with polytomous data. The measures of an ability test were adjusted for the presence of anxiety and results indicated that differential item functioning was observed at both the global level and the most difficult ability item. It is concluded that the difficulty levels of a scale are heavily influenced by situational factors during testing, such as students’ entry levels of motivation and affect. [ABSTRACT FROM AUTHOR]

The purpose of the present study was to predict and explain the academic cheating behaviors of elementary school students with learning disabilities (LD) by applying the cusp catastrophe model. Participants were 32 students with identified LD from state governmental agencies although all both them and the typical students participated in the experimental manipulation (N= 480). Academic cheating was assessed using an empirical paradigm where true achievement was subtracted from achievement in a test without proper invigilation. Data analysis supported the proposed cusp catastrophe models, where mastery-related motives acted as asymmetry and performance goals as bifurcation variables respectively. These findings were confirmed with application of the interactive goal hypothesis (Barron & Harackiewicz, 2001), where the interactive approach and avoidance performance goal term functioned as a splitting factor in the relationship between adaptive motivation and performance. [ABSTRACT FROM AUTHOR]

The goal of the study was to assess differences between native Greek and bilingual, immigrant children of Albanian descent learning Greek as a second language on a receptive vocabulary measure. Vocabulary measures were obtained at five time points, 6 months apart, from 580 children attending Grades 2-4. Individual variability on both initial performance (intercept) and growth rate (slope) was assessed using hierarchical linear modeling, which included linguistic/ethnic group, parental education (as a socioeconomic status [SES] indicator), gender, and a measure of nonverbal cognitive ability as time-invariant predictors of vocabulary growth. Results indicated that linguistic/ethnic group, parental education, and baseline nonverbal cognitive ability were significant predictors of initial vocabulary scores, whereas only linguistic/ethnic group and nonverbal ability accounted for significant variability in vocabulary growth rates. Additional analyses confirmed that linguistic/ethnic group remained a significant predictor of receptive vocabulary knowledge at both the intercept and the slope levels even after controlling for the initial differences between groups on parental education and block design subtest scores. [ABSTRACT FROM AUTHOR]

We evaluated the relationship between victimization and academic achievement from a nonlinear perspective using a cusp catastrophe model. Participants were 62 students with identified learning disabilities (LD) using statewide criteria in Greece. Students participated in a 2-year cohort-sequential design. Reading assessments involved measures of word accuracy, pseudoword accuracy, and reading comprehension using a standardized reading battery. Victimization was assessed using the Olweus (1993) questionnaire. Analysis involved estimation of the cusp model with the dependent variable (word accuracy or reading comprehension) being predicted by pseudoword or word decoding (the asymmetry factor) and victimization (the bifurcation or splitting factor). We hypothesized that the relationship between word and pseudoword decoding or reading comprehension and word decoding would be disrupted by the presence of high levels in victimization. That is, increased victimization following a critical point would be associated with unpredictable, sudden, and nonlinear changes in students' achievement in reading. Results were consistent with this hypothesis. Specifically, achievement in word decoding and reading comprehension entered a state of uncertainty (chaos) when victimization reached a certain threshold value. Consequently, victimization may not only affect emotional functioning but also seriously disrupt both reading achievement and self-regulatory processes related to reading. [ABSTRACT FROM AUTHOR]

The purpose of the present study was to evaluate a bullying prevention program that involved eleven 90-minute, highly structured workshops conducted at the classroom level on a weekly basis. The intervention aimed to increase student awareness of bullying and its impact, increase empathy toward victims, and enhance positive attitudes toward school and academic achievement. Participants were 666 students who were selected from 20 elementary schools using stratified random-sampling procedures from a large metropolitan area of southern Greece. Students were randomly assigned to experimental and control groups and were provided measures of bullying and victimization behaviors at pretest and posttest (Olweus, 1996). Results indicated that there were statistically significant decreases in bullying and victimization behaviors from pretest to posttest. Specifically, victimization rates in the experimental group were reduced from pretest to posttest by 55.4%. The respective decreases in the control group were 23.3%. Similarly, bullying rates decreased by 55.6% at posttest compared with pretest in the experimental group, and the combined type decreased by 66.7%. Furthermore, a latent class analysis provided qualitative means on the specific categories in which decreases of negative behaviors were observed. Additional positive effects were observed with increases in positive attitudes toward school (school liking). We conclude that the current prevention program effectively reduced bullying and victimization in the elementary schools in Greece and holds promise for influencing the overall school experience. [ABSTRACT FROM AUTHOR]