[Influence of genetic and environment factors on aggressive behavior in twin children].

Objective: To investigate the influence of genetic and environmental factors on aggressive behavior in twin children, and to provide clues for further exploring the causal relationship between such factors and aggressive behavior.

Methods: A questionnaire was used to investigate aggressive behavior, temperament type and parenting style among 261 twin children aged 4-12.8 years.

[Effects of rs4274224 polymorphisms in the DRD2 gene and family factors on the regularity based on the temperament in school-age children].

Objective: To study the effects of rs4274224 polymorphisms in the DRD2 gene, family factors and their interaction on the regularity in school-age children.

Methods: The rs4274224 polymorphisms were genotyped using Sequenom Mass Array. The regularity was assessed based on the Middle Childhood Temperament Questionnaire (MCTQ).

[Association between rs1079595 polymorphisms in the DRD2 gene and the distractibility based the temperament in school-age children].

Objective: To study the association between rs1079595 polymorphisms in the DRD2 gene and the distractibility in school-age children.

Methods: The genotyping at rs1079595 was performed and the distractibility was measured based on the temperament questionnaire in 120 8-12 years old school-age children in order to analyze the effects of the rs1079595 polymorphism and its interaction with the gender, age and delivery mode on the distractibility.

Results: There was an association between the distractibility and rs1079595 polymorphisms.

[The method and efficacy for screening neonatal tetanus in high risk areas in China].

Objectives: To establish a method for screening neonatal tetanus (NT) in high risk areas in China using multi-sources data.

Methods: We adopted six NT-related indicators from National Notifiable Disease Report System (NNDRS) and National Maternal and Child Health Annual Report System, to calculate weighted high-risk score at prefecture level in 2010 and 2011. And we selected the top 30 high risk cities, and compared the scores with the actual NT incidence ranking and WHO scoring.

Mental health among left-behind preschool-aged children: preliminary survey of its status and associated risk factors in rural China.

Objective: A large proportion of preschoolers have been left behind due to parental migration in rural China. We conducted a preliminary cross-sectional survey to investigate the mental health of these left-behind preschool-aged children (LBPC) and associated risk factors.

Methods: A total of 750 LBPC, comprising 217 and 433 children left behind as a result of migration of either or both parents, respectively, and 100 controls were enrolled from two counties in Anhui province, China.