Knowledge of obstetric and environmental influences on DevelopmentalCoordination Disorder (DCD) helps provide increased understanding of the mechanisms underlying the disorder. However, the literature to date has not adequately examined the obstetric and environmental risk factors for DCD in a population-based sample. The current study was therefore conducted to explore the prenatal, perinatal, neonatal, and family environmental risk factors for DCD. A total of 2185 children aged 3-10 years from a national representative sample in China were included; the Movement Assessment Battery for Children-2 was used to assess motor function, and a questionnaire was completed by parents. DCD was identified in 156 children according to the DSM-5 criteria. Multilevel logistic regression was used, and comparisons were made between the DCD and non-DCD group. The results confirmed that male sex, BMI score, preterm birth, and some prenatal conditions are significant risk factors for DCD. Parents' education level and one-child status as two significant environmental risk factors for DCD appear largely independent of other risk factors in the Chinese population. This study provides an opportunity to explore the etiology of DCD and suggest potential assessment, monitoring and intervention programs for DCD that could be examined in the future.

The Test component of the Movement Assessment Battery for Children 2 nd Edition (Movement ABC-2) is used worldwide to identify children with Developmental Coordination Disorder (DCD). In China, practitioners have been using this test with the assumption that the published UK norms are valid for Chinese children. However no systematic investigation has previously been undertaken to check this assumption. 2185 children aged 3-10 years old from a national representative sample in China were therefore recruited to the current study. Performance on the Movement ABC-2 was assessed and compared with the UK standardization norms. Gender differences were also examined. The comparisons revealed that Chinese children were generally better in Manual Dexterity and Balance tasks compared to their UK peers; while UK children were better in Aiming & Catching tasks. Further analysis showed an interaction of country and age with mixed results. For both countries, girls were generally better in Manual Dexterity and Balance tasks, and boys were generally better in Aiming & Catching. Possible explanations for the country differences are discussed. The results suggest that local norms for the Movement ABC-2 Test are needed in China. What this paper adds?Previous studies have reported cross-cultural differences between Western and East Asian children when assessing their motor performance with the first and second editions of the Movement ABC Test. However the results were mixed in terms of different age groups and different motor components. Children with Developmental Coordination Disorder (DCD) have recently started to be recognised in the healthcare and education system in mainland China, and the Movement ABC Test has been widely used by researchers and practitioners. However, little is known about the suitability of applying the published UK norms of the assessment on the Chinese population. Using a national representative sample, the current study provided original data on the cultural differences in motor development between Chinese children and their UK peers on the Movement ABC-2 Test. We propose that the more intensive training program in nurseries in China might partially explain some of the differences found between children from the two countries. Highlights:• Chinese & UK children aged 3-10 have different profiles on the Movement ABC-2 Test;• Gender differences in motor development are consistent across China and the UK;• Local norms for the Movement ABC-2 Test are needed in China.

Cognitive deficits have been commonly observed in children with developmental coordination disorder (DCD), including memory, attention, and executive function difficulties. The present study evaluates the specific cognitive deficits in Chinese children with DCD, through a number of tests. A total of 401 children aged 7 to 10 years old from primary schools in Guangdong Province, China, participated in this study. Using the guidelines of the Movement Assessment Battery for Children (“Movement ABC-2”), a measurement tool of motor function ability, the children were divided into a DCD group, a group identified as being at risk of DCD, and a normal control group. The results of our analysis revealed that children’s overall motor abilities could predict their overall cognitive ability, reaction time, memory, and attention. The performance of the DCD children was worse than that of the other two groups in terms of reaction time. The DCD group also returned lower scores for executive function than the normal control group did. A regression analysis showed that the cognitive deficits in children with DCD center mainly on poor executive function rather than attention and memory issues. These findings provide preliminary results regarding the cognitive deficits in Chinese children with DCD and have potential applications for the diagnosis and treatment of the disorder.

Parents and teachers have knowledge of children’s daily motor performance yet may make different judgments about the levels of competence observed at home and school. The current study aimed to examine the discrepancies between parent and teacher reports using the Movement ABC-2 Checklist and the Developmental Coordination Disorder Questionnaire (DCDQ) on children with and without suspected Developmental Coordination Disorder (DCD). The Movement ABC-2 Test was administered to 1276 children aged 5–10 years in China. The Movement ABC-2 Checklist and DCDQ were completed by both parents and teachers of all children. A total of 172 children achieving a score below the 15th percentile on the Movement ABC-2 Test were identified as children with suspected DCD. Both parents and teachers showed suitable agreement in judging children’s motor competence but low sensitivity in identifying children with DCD. Parent scores of children’s motor competence were more closely associated with test performance scores compared to teacher scores. Teachers tended to over-rate children’s motor competence. The motor difficulties identified by parents were associated with low Movement ABC-2 Test scores on Manual Dexterity and Balance components, while motor difficulties identified by teachers were associated with the Balance component only. The results demonstrated discrepancies between parent and teacher reports, suggesting the importance of using a range of measures to identify and describe motor difficulties in children.

The planting amount is determined by farmers according to the profit of planting economic crops. Moreover, the planting profit is estimated by using the statistical methods. The relation between the planting amount and the profit is similar to a linear function. However, the straight line equation has been set by using the historical data, calculating the slope of the straight line or adopting the least squares method. Therefore, the planting amount in next year will be calculated based on the equation. In a word, the planting amount in next year will be adjusted and controlled on the basis of the calculated planting amount and the real demand in the market.