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Prediction from early development to later achievement has the potential to improve clinical and educational service delivery as well as to inform developmental theory. In this longitudinal study, we asked how well can educational achievement measured in the final year (Grade 9, age 15) of compulsory education--both overall and for outcomes in the lowest 20%--be predicted from information available in the first 3 years of life, particularly early expressive vocabulary? Measures for 2,767 children (1,345 males, 1,422 females) aged 16 to 30 months on early expressive vocabulary, along with family socioeconomic status (parental education, occupation, and household income), other demographic information (gender, birth order, parental age, social benefits, etc.), timing and nature of early child care, and early home literacy experience, were used to predict performance on Danish Upper Secondary School Leaving Exam (USSLE) in Danish, English, Math, and Science. A cross-validated combination of Lasso (Least absolute shrinkage and selection operator) and ordinary least squares regression was the primary analysis for continuous outcomes and cross-validated Lasso and logistic regression for categorical outcomes. With respect to continuous outcome measures, the patterns of prediction varied with specific domain; R2 ranged from 9.4% to 21.4%. With respect to low USSLE performance, area under the curve statistics ranged from 64.1% to 72.2%. In all domains, early childhood expressive vocabulary made a significant unique contribution to the outcome when measured over the full range. The prediction was also significant for vocabulary to low Danish and English scores although not for Math and Science. Although the predictions were not strong enough for clinical diagnosis on their own, they demonstrate that low early vocabulary is an important and measurable risk condition that can direct early intervention and thus contribute to later educational attainment.

In the current study, the strength-based questionnaire Social-Emotional Assessment/Evaluation Measure (SEAM)--Research Edition was for the first time applied in a nationally representative sample of 0- to 6-year-old children. The focus of this study was the measurement properties of a Danish adaptation of SEAM. Rasch analysis was used to examine the criterion-related construct validity as well as accuracy and reliability of the measurement. The primary goal was to determine whether the 10 SEAM benchmarks could be combined into one total score or into a limited number of subscores. Data were collected by child-care providers in nonparental child-care facilities, and the response rate was high (95%; N = 9,827). The 10 benchmarks were successfully combined into two overall indexes: Empathy and Self-regulation & Cooperation. The reliability coefficients ranged from adequate (0.79) to excellent (0.94). However, standard errors of measurements were relatively large for the two indexes.

Research has shown that contoids (phonetically defined consonants) may provide more robust and reliable cues to syllable and word boundaries than vocoids (phonetically defined vowels). Recent studies of Danish, a language characterized by frequent long sequences of vocoids in speech, have suggested that the reduced occurrence of contoids may make speech in it intrinsically harder to segment than in closely related languages such as Norwegian. We addressed this hypothesis empirically in an artificial language learning experiment with native speakers of Danish, Norwegian, and English. We tested whether artificial speech consisting of concatenated contoid-vocoid syllables is easier to segment than speech consisting of vocoid-vocoid syllables where the first segment is a semivowel and the second a full vowel. Contrary to what was expected, we found no effect of the phonetic makeup of the syllables on speech segmentability. Possible interpretations and implications of this result are discussed. Open Practices This article has been awarded Open Materials and Open Data badges. All materials and data are publicly accessible via the Open Science Framework at https://osf.io/rmjtg. Learn more about the Open Practices badges from the Center for Open Science: https://osf.io/tvyxz/wiki.

Sound assessment tools are needed to evaluate effects of mathematics interventions that familiarize children with early mathematics concepts before they enter the formal school system. We developed a short version of an existing early mathematics tool based on analyses of data collected in a nationally representative Danish sample. Research findings: The Danish adaptation and development process of the Tools for Early Assessment in Math (TEAM) for children aged 3-6 years was carried out in four steps: (a) choosing and translating relevant items, (b) conducting a pilot study, (c) testing items in a representative sample of Danish children aged 3-6 years (n = 5,621), and (d) analyses based on Rasch models. The process resulted in a final 19-item version--the DK-TEAM (final)--that has no differential item functioning relative to age and gender and is sensitive to the full range of abilities. The great majority of the children viewed the test as enjoyable. Practice or Policy: The DK-TEAM (final) appears to be broadly applicable for young Danish children, though the modest reliability at 3 years (which may be remediable by adding easy items) should be kept in mind.

As early childhood education programming expands across the globe, there is an increased need to understand how features of these programs influence children's development. The composition of children's age within a classroom is one such feature, although it is much less studied than other features. Theoretical and empirical evidence suggests that children's development may be influenced by the age range of their classmates. This study examines the relations between classroom age variability on children's vocabulary development for 2,743 children between the ages of two years, nine months, and six years, 11 months enrolled in early childhood education settings in Denmark. Findings indicate a significant nonlinear relationship between the range of child age within a classroom and children's vocabulary development, such that classrooms with a maximum age range of 24 months were associated with the greatest gains in vocabulary growth. Results give direction to policy efforts focused on expansion of early childhood education programming.

The focus of this article is Faroese children's early vocabulary acquisition using a Faroese adaptation of the MacArthur-Bates Communicative Development Inventories (MBCDI) parental report. The study is a population-based cross-sectional study including 1135 children aged 8-36 months. The article has two objectives: the first is to describe the Faroese adaptation of the MBCDI, and the second is to examine Faroese children's early vocabulary acquisition. Selected percentile levels for vocabulary comprehension and production are presented, as well as gender differences and developmental trends. The study finds evidence for a spurt in productive vocabulary in the second year of life, and that vocabulary comprehension preceded production, with both showing increases with age similar to those described in the literature for other languages. Girls had an advantage in vocabulary production over boys, resulting in a significant gender difference. Finally, the early lexical composition of Faroese children is notable in that it contains a substantial number of baby-word forms.

Vocabulary input frequency influences age of acquisition, and is also an essential control for investigating the influence of other factors. We propose a new method of frequency estimation, self-report. 918 Danish-speaking parents of 12-36-month-old children estimated their frequency of use of 725 words. Self-report was substantially correlated with both language sample based frequencies (0.67) and frequencies of a large written corpus of Danish (0.58). Correlations within vocabulary categories between frequency and age of acquisition, restricted to words occurring in the language samples, were comparable for the two estimates. Overall, self-report based frequency estimates appear to have a promising degree of validity, which reflects their greatest strength, independence of the situation.

Structural quality in childcare centers is considered a precondition for process quality, which in turn is related to children's outcomes. However, the evidence on relations between structural and process quality is mixed. Moreover, despite strong theoretical claims, empirical evidence supporting the indirect relation of structural features through process quality on child outcomes is scarce. The current study contributes to the knowledge by (a) investigating the direct relations of structural teacher and classroom features with growth in children's language and preliteracy skills in a sample of more than 3,000 children, (b) studying the associations of process quality with children's outcomes using the widely used Classroom Assessment Scoring System Pre-K observational measure among more than 400 teachers, and (c) testing indirect effects of structural quality through process quality on growth in children's skills. Process quality was generally directly positively associated with gains in children's language and preliteracy skills, whereas structural quality showed few direct relations. In addition, the average level of children's initial language and preliteracy skills were positively related to gains, as was classrooms' proportion of non-Danish children (indirectly through process quality). The results illustrate the complexities of relations between structural and process quality and children's outcomes and warrant further research.

The present article reports results of a real-world effectiveness trial conducted in Denmark with six thousand four hundred eighty-three 3- to 6-year-olds designed to improve children's language and preliteracy skills. Children in 144 child cares were assigned to a control condition or one of three planned variations of a 20-week storybook-based intervention: a base intervention and two enhanced versions featuring extended professional development for educators or a home-based program for parents. Pre- to posttest comparisons revealed a significant impact of all three interventions for preliteracy skills (d = 0.21-0.27) but not language skills (d = 0.04-0.16), with little differentiation among the three variations. Fidelity, indexed by number of lessons delivered, was a significant predictor of most outcomes. Implications for real-world research and practice are considered.

Purpose: This study investigated the feasibility and potential validity of an item response theory (IRT)-based computerized adaptive testing (CAT) version of the MacArthur-Bates Communicative Development Inventory: Words & Sentences (CDI:WS; Fenson et al., 2007) vocabulary checklist, with the objective of reducing length while maintaining measurement precision. Method: Parent-reported vocabulary for the American CDI:WS norming sample consisting of 1,461 children between the ages of 16 and 30 months was used to investigate the fit of the items to the 2-parameter logistic IRT model and to simulate CDI-CAT versions with 400, 200, 100, 50, 25, 10, and 5 items. Results: All but 14 items fit the 2-parameter logistic IRT model, and real data simulations of CDI-CATs with at least 50 items recovered full CDI scores with correlations over 0.95. Furthermore, the CDI-CATs with at least 50 items had similar correlations with age and socioeconomic status as the full CDI:WS. Conclusion: These results provide strong evidence that a CAT version of the CDI:WS has the potential to reduce length while maintaining the accuracy and precision of the full instrument.

This article presents results from a large population-based study of early communicative development in Norwegian children using an adaptation of the MacArthur-Bates Communicative Development Inventories, comprising 6574 children between 8 and 36 months. Data were collected via the Internet. In accordance with similar studies from other languages, it was found that vocabulary comprehension preceded vocabulary production, and that both use of gestures, comprehension and production of vocabulary, and grammatical complexity increased with age. Moreover, boys lagged behind girls in vocabulary production and comprehension, in grammatical complexity, and in certain types of imitation--this gender difference seems to come out more clearly in this study's data than in data from other languages.

This article presents the methodology used in a population-based study of early communicative development in Norwegian children using an adaptation of the MacArthur-Bates communicative development inventories (CDI), comprising approximately 6500 children aged between 0 ; 8 and 3 ; 0. To our knowledge, this is the first CDI study collecting data via the Internet. After a short description of the procedures used in adapting the CDI to Norwegian and the selection of participants, we discuss the advantages and potential pitfalls of using web-based forms as a method of data collection. We found that use of web-based forms was far less time-consuming, and therefore also far less expensive than the traditional paper-based forms. The risk of coding errors was virtually eliminated with this method. We conclude that in a society with high access to the Internet, this is a method well worth pursuing.