This study aimed to test the relationship between length of residence and mental health in a school-based sample of migrant children who studied in migrant schools.A total of 7,296 rural-to-urban migrant children were recruited from 58 schools in Beijing and assessed by the State-Trait Anxiety Inventory and Children's Depression Inventory.A quadratic relationship was found between mental health and length of residence. The results suggested that the scores for anxiety and depression were high during the initial resettlement after migrating and then decreased. However, after approximately 8 years, the scores increased. Our findings also showed a significant moderating effect of family socioeconomic status on the relation between mental health and length of residence.This study provided empirical evidence for a better understanding of psychosocial factors on the mental health of migrant children during the process of urbanization in China.
To study the volatile compounds of Salix babylonica, and to provide scientific basis for efficacy of attracting natural enemies and medicinal value of Salix babylonica.The volatile compounds were collected from Salix babylonica by dy- namic headspace absorption method, and analyzed by gas chromatography-mass spectrum( GC-MS).Forty-one volatile com- pounds were identified from Salix babylonica. Intact plant of Salix babylonica had thirty-three kinds of volatile compounds and aphid-in- fested plant of Salix babylonica had thirty-eight kinds of volatile compounds. The volatile components of intact plant and aphid-infested plant had significant differences in the composition and proportion. Among them,the volatile components of aphid-infested plant added six kinds of vinyl materials,one kind of aldehyde and one kind of ketone.Adding volatile components,which included vinyl materials,aldehydes and ketones,might have the efficacy of attracting natural enemies. The volatile components might play an important role in the ecological protection for Salix babylonica. The functional components from the volatile compounds had good medicinal value, which are worthy of further research.
Objective To examine the social anxiety level and its related factors in left-behind children.Methods To investigate the social anxiety level and its related factors in 876 students(including left-behind children and common children)from elementary schools or high schools in local villages and towns of Chongqing and Guizhou.Results The social anxiety of left-behind children(7.85±3.66,7.77±3.75)was obviously higher than that of the children whose parents both stayed at home(6.75±3.72,P＜0.01).Compared with children of grade two in junior high school and children of grade one in senior high school(7.75±3.69,7.95±3.54),the social anxiety of the fifth grade children in primary school(6.55±3.88)was obviously lower(P＜0.01).Self-esteem and social anxiety were significantly negatively related in left-behind children(r=-0.22,P＜0.01;r=-0.17,P＜0.05;r=-0.32,P＜0.01).To left-behind children in junior or senior high school,their age when parents left them was an important factor for their social anxiety.To left-behind children of grade five in primary school,the contact frequency between them and parents had some important influence on their social anxiety.Conclusion 1)Left-behind children have a relatively high level of social anxiety.They need some appropriate psychological interventions,especially when they are in junior or senior high sch001.2)Social anxiety is closely related with self-esteem in left-behind children.3)Early separation from parents would aggravate social anxiety of leftbehind children,and more frequent contact with parents would relieve their social anxiety.
Key words:
Social anxiety; Related factors; Left-behind children
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